[ObjC] Output directive to disable clang-format on generated files.

Regenerate the WKTs accordingly.
diff --git a/objectivec/GPBAny.pbobjc.h b/objectivec/GPBAny.pbobjc.h
index 7fb4129..e30acc0 100644
--- a/objectivec/GPBAny.pbobjc.h
+++ b/objectivec/GPBAny.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -172,3 +174,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBAny.pbobjc.m b/objectivec/GPBAny.pbobjc.m
index 7632c8c..e838675 100644
--- a/objectivec/GPBAny.pbobjc.m
+++ b/objectivec/GPBAny.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBAny.pbobjc.h"
 
@@ -98,3 +100,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBApi.pbobjc.h b/objectivec/GPBApi.pbobjc.h
index 1848aa6..3cd0821 100644
--- a/objectivec/GPBApi.pbobjc.h
+++ b/objectivec/GPBApi.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -296,3 +298,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBApi.pbobjc.m b/objectivec/GPBApi.pbobjc.m
index 7f86a08..88a215e 100644
--- a/objectivec/GPBApi.pbobjc.m
+++ b/objectivec/GPBApi.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBApi.pbobjc.h"
 
@@ -352,3 +354,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBDuration.pbobjc.h b/objectivec/GPBDuration.pbobjc.h
index d6236b0..fda9b47 100644
--- a/objectivec/GPBDuration.pbobjc.h
+++ b/objectivec/GPBDuration.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -131,3 +133,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBDuration.pbobjc.m b/objectivec/GPBDuration.pbobjc.m
index 11ba5e5..bc61092 100644
--- a/objectivec/GPBDuration.pbobjc.m
+++ b/objectivec/GPBDuration.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBDuration.pbobjc.h"
 
@@ -93,3 +95,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBEmpty.pbobjc.h b/objectivec/GPBEmpty.pbobjc.h
index 5878223..26ef9a6 100644
--- a/objectivec/GPBEmpty.pbobjc.h
+++ b/objectivec/GPBEmpty.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -58,3 +60,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBEmpty.pbobjc.m b/objectivec/GPBEmpty.pbobjc.m
index 8aefddb..49f7030 100644
--- a/objectivec/GPBEmpty.pbobjc.m
+++ b/objectivec/GPBEmpty.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBEmpty.pbobjc.h"
 
@@ -69,3 +71,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBFieldMask.pbobjc.h b/objectivec/GPBFieldMask.pbobjc.h
index b7eccff..87898ad 100644
--- a/objectivec/GPBFieldMask.pbobjc.h
+++ b/objectivec/GPBFieldMask.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -259,3 +261,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBFieldMask.pbobjc.m b/objectivec/GPBFieldMask.pbobjc.m
index ab25d3f..f820fd8 100644
--- a/objectivec/GPBFieldMask.pbobjc.m
+++ b/objectivec/GPBFieldMask.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBFieldMask.pbobjc.h"
 
@@ -82,3 +84,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBSourceContext.pbobjc.h b/objectivec/GPBSourceContext.pbobjc.h
index b17fec0..e747dc0 100644
--- a/objectivec/GPBSourceContext.pbobjc.h
+++ b/objectivec/GPBSourceContext.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -63,3 +65,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBSourceContext.pbobjc.m b/objectivec/GPBSourceContext.pbobjc.m
index 376d442..094f323 100644
--- a/objectivec/GPBSourceContext.pbobjc.m
+++ b/objectivec/GPBSourceContext.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBSourceContext.pbobjc.h"
 
@@ -82,3 +84,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBStruct.pbobjc.h b/objectivec/GPBStruct.pbobjc.h
index ff4eefd..eaa531e 100644
--- a/objectivec/GPBStruct.pbobjc.h
+++ b/objectivec/GPBStruct.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -190,3 +192,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBStruct.pbobjc.m b/objectivec/GPBStruct.pbobjc.m
index 726cfb8..3707178 100644
--- a/objectivec/GPBStruct.pbobjc.m
+++ b/objectivec/GPBStruct.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBStruct.pbobjc.h"
 
@@ -295,3 +297,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBTimestamp.pbobjc.h b/objectivec/GPBTimestamp.pbobjc.h
index 8203383..6d6a930 100644
--- a/objectivec/GPBTimestamp.pbobjc.h
+++ b/objectivec/GPBTimestamp.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -162,3 +164,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBTimestamp.pbobjc.m b/objectivec/GPBTimestamp.pbobjc.m
index 72d348f..1792ecb 100644
--- a/objectivec/GPBTimestamp.pbobjc.m
+++ b/objectivec/GPBTimestamp.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBTimestamp.pbobjc.h"
 
@@ -93,3 +95,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBType.pbobjc.h b/objectivec/GPBType.pbobjc.h
index 969219f..ef9b74b 100644
--- a/objectivec/GPBType.pbobjc.h
+++ b/objectivec/GPBType.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -430,3 +432,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBType.pbobjc.m b/objectivec/GPBType.pbobjc.m
index f5fc1ef..5c8c73e 100644
--- a/objectivec/GPBType.pbobjc.m
+++ b/objectivec/GPBType.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBType.pbobjc.h"
 
@@ -707,3 +709,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBWrappers.pbobjc.h b/objectivec/GPBWrappers.pbobjc.h
index e6741ae..11b052a 100644
--- a/objectivec/GPBWrappers.pbobjc.h
+++ b/objectivec/GPBWrappers.pbobjc.h
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -205,3 +207,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on
diff --git a/objectivec/GPBWrappers.pbobjc.m b/objectivec/GPBWrappers.pbobjc.m
index b02a071..45ee1a3 100644
--- a/objectivec/GPBWrappers.pbobjc.m
+++ b/objectivec/GPBWrappers.pbobjc.m
@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBWrappers.pbobjc.h"
 
@@ -441,3 +443,5 @@
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on