[gtest] Disable new posix::FOpen Windows implementation for now

The new implementation was brought in with the gtest update in
a866ce7, but it crashes when
building with rpmalloc, see
llvm#65823 (comment)

Comment out the new implementation basically gives us the code
before the gtest update.

Author: zmodem

third-party/unittest/googletest/include/gtest/internal/gtest-port.h

@@ -2087,7 +2087,10 @@ GTEST_DISABLE_MSC_DEPRECATED_PUSH_()
 inline int ChDir(const char* dir) { return chdir(dir); }
 #endif
 inline FILE* FOpen(const char* path, const char* mode) {
-#if defined(GTEST_OS_WINDOWS) && !defined(GTEST_OS_WINDOWS_MINGW)
+// FIXME: This doesn't work when building with rpmalloc, see
+// https://github.com/llvm/llvm-project/pull/65823#issuecomment-1739820534
+// so hacking it out for now.
+#if defined(GTEST_OS_WINDOWS) && !defined(GTEST_OS_WINDOWS_MINGW) && 0
   struct wchar_codecvt : public std::codecvt<wchar_t, char, std::mbstate_t> {};
   std::wstring_convert<wchar_codecvt> converter;
   std::wstring wide_path = converter.from_bytes(path);