Add C11 localtime_r and gmtime_r shims for Windows

Add C11 localtime_r and gmtime_r shims for Windows

On Windows, C11 localtime_r() and gmtime_r() functions are not
available.  While localtime() and gmtime() functions are already thread
safe because they use Thread Local Storage, it's quite ugly to #ifdef
around every localtime_r() and gmtime_r() usage to make the usage also
thread-safe on POSIX platforms.

The commit adds wrappers around Windows localtime_s() and gmtime_s()
functions.

NOTE: The implementation of localtime_s and gmtime_s in Microsoft CRT
are incompatible with the C standard since it has reversed parameter
order and errno_t return type.

(cherry picked from commit 08f4c7d6c094c93ce7df093a8aa0890618959c83)