Googletest export

Tag the function generated by MATCHER with GTEST_ATTRIBUTE_UNUSED_ to fix CI builds of gmock-matchers_test.cc vs. -Wunused-function.

See https://github.com/google/googletest/pull/2697 for breakage.

PiperOrigin-RevId: 293669752

googlemock/include/gmock/gmock-generated-matchers.h

@@ -80,7 +80,7 @@
       }\
     };\
   };\
-  inline name##Matcher name() {\
+  GTEST_ATTRIBUTE_UNUSED_ inline name##Matcher name() {\
     return name##Matcher();\
   }\
   template <typename arg_type>\