[libcxx Windows][PATCH] uselocale change.

[João Matos]

Patch looks correct according to these docs:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/uselocale.html

"If the newloc argument is a null pointer, the object returned is the
current locale or LC_GLOBAL_LOCALE if there has been no previous call to
uselocale() for the current thread."

Not sure if it handles the LC_GLOBAL_LOCALE part correctly though.

--
João Matos
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