Sets SKIP_INSTALL to YES for the ProtocolBuffers target (#8560)

objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj

diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
index f0f82c8..03e0580 100644
--- a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
@@ -836,6 +836,7 @@
 			buildSettings = {
 				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = ProtocolBuffers;
+				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				USER_HEADER_SEARCH_PATHS = "$(SRCROOT)";
 			};
@@ -846,6 +847,7 @@
 			buildSettings = {
 				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = ProtocolBuffers;
+				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				USER_HEADER_SEARCH_PATHS = "$(SRCROOT)";
 			};