[PATCH] internal_setlocale tweak

[Andy Koppe]

winsup/cygwin/ChangeLog:
	* nlsfuncs.cc (internal_setlocale, initial_setlocale):
	Move check whether charset has changed to internal_setlocale,
	to avoid unnecessary work when invoked via CW_INT_SETLOCALE.

Sufficiently trivial, I hope.

Andy
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