Googletest export

Fix MSVC warning C4275: non dll-interface class
'testing::MatcherDescriberInterface' used as base for dll-interface
class 'testing::internal::MatcherBase<std::string>'

Fixes #3415

PiperOrigin-RevId: 377352684

googletest/include/gtest/gtest-matchers.h

@@ -106,7 +106,7 @@ inline MatchResultListener::~MatchResultListener() {
 
 // An instance of a subclass of this knows how to describe itself as a
 // matcher.
-class MatcherDescriberInterface {
+class GTEST_API_ MatcherDescriberInterface {
  public:
   virtual ~MatcherDescriberInterface() {}