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Define sigsetjmp/siglongjmp only if __POSIX_VISIBLE

sigsetjmp and siglongjmp are POSIX extensions but are not properly guarded in machine/setjmp.h. This leads to the problem reported here: 

   https://cygwin.com/ml/cygwin/2017-08/msg00060.html

Patch attached.

Ken

Attachment: 0001-Define-sigsetjmp-siglongjmp-only-if-__POSIX_VISIBLE.patch
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