Add CMake option protobuf_DEBUG_POSTFIX
diff --git a/cmake/libprotoc.cmake b/cmake/libprotoc.cmake
index 7aa92ee..497861f 100644
--- a/cmake/libprotoc.cmake
+++ b/cmake/libprotoc.cmake
@@ -93,4 +93,5 @@
 target_link_libraries(libprotoc libprotobuf)
 set_target_properties(libprotoc PROPERTIES
     COMPILE_DEFINITIONS LIBPROTOC_EXPORTS
-    OUTPUT_NAME ${LIB_PREFIX}protoc)
+    OUTPUT_NAME ${LIB_PREFIX}protoc
+    DEBUG_POSTFIX "${protobuf_DEBUG_POSTFIX}")