Revert "remove MSVC workaround: wmain link error in the static library"

This reverts commit 298a40f0.

googlemock/src/gmock_main.cc

@@ -48,13 +48,20 @@ void loop() { RUN_ALL_TESTS(); }
 #endif
 
 #else
-#if __MSC_VER
+
+// MS C++ compiler/linker has a bug on Windows (not on Windows CE), which
+// causes a link error when _tmain is defined in a static library and UNICODE
+// is enabled. For this reason instead of _tmain, main function is used on
+// Windows. See the following link to track the current status of this bug:
+// https://web.archive.org/web/20170912203238/connect.microsoft.com/VisualStudio/feedback/details/394464/wmain-link-error-in-the-static-library
+// // NOLINT
+#if GTEST_OS_WINDOWS_MOBILE
 # include <tchar.h>  // NOLINT
 
 GTEST_API_ int _tmain(int argc, TCHAR** argv) {
 #else
 GTEST_API_ int main(int argc, char** argv) {
-#endif  // __MSC_VER
+#endif  // GTEST_OS_WINDOWS_MOBILE
   std::cout << "Running main() from gmock_main.cc\n";
   // Since Google Mock depends on Google Test, InitGoogleMock() is
   // also responsible for initializing Google Test.  Therefore there's