kernel32: avoid thread-unsafe function gmtime()

[Dan Kegel]

Using gmtime() in a multithreaded program could
result in invalid results.  So use the safer alternative
gmtime_r() if it's available.

(There is another instance of gmtime() in that file,
but it's unused on platforms that have timegm().
I think that's present on both Linux and BSD, so
it doesn't seem work fixing.)

This is probably a post-1.0 change, but what the heck,
may as well post it now.

I stumbled onto this while looking for something else,
so this really is a solution looking for a problem.
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