libstdc++: Re-enable workaround for _wstat64 bug [PR 88881]

This wasn't fixed upstream for mingw-w64 so we still need the
workaround.

libstdc++-v3/ChangeLog:

	PR libstdc++/88881
	* src/c++17/fs_ops.cc (fs::status): Re-enable workaround.

libstdc++-v3/src/c++17/fs_ops.cc

@@ -1462,7 +1462,6 @@ fs::status(const fs::path& p, error_code& ec) noexcept
   auto str = p.c_str();
 
 #if _GLIBCXX_FILESYSTEM_IS_WINDOWS
-#if ! defined __MINGW64_VERSION_MAJOR || __MINGW64_VERSION_MAJOR < 6
   // stat() fails if there's a trailing slash (PR 88881)
   path p2;
   if (p.has_relative_path() && !p.has_filename())
@@ -1479,7 +1478,6 @@ fs::status(const fs::path& p, error_code& ec) noexcept
 	}
       str = p2.c_str();
     }
-#endif
 #endif
 
   stat_type st;