Adds support for building Google Mock as a shared library (DLL).

include/gmock/gmock.h

@@ -82,11 +82,11 @@ GMOCK_DECLARE_string_(verbose);
 // Since Google Test is needed for Google Mock to work, this function
 // also initializes Google Test and parses its flags, if that hasn't
 // been done.
-void InitGoogleMock(int* argc, char** argv);
+GTEST_API_ void InitGoogleMock(int* argc, char** argv);
 
 // This overloaded version can be used in Windows programs compiled in
 // UNICODE mode.
-void InitGoogleMock(int* argc, wchar_t** argv);
+GTEST_API_ void InitGoogleMock(int* argc, wchar_t** argv);
 
 }  // namespace testing