ignore non-portable warning for PR50722

[Mike Stump]

The suggestion was made in the PR to use -w; found this by testing on such a target, and didn't want to endlessly add systems to the skip list.

2012-04-06  Mike Stump  <mikestump@comcast.net>

	PR testsuite/50722
	* gcc.dg/pr49994-3.c: Use -w to squelch non-portable warnings.


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