Fix macro check for existence of sigtimedwait() on non-apple platforms.
Fix macro check for existence of sigtimedwait() on non-apple platforms.

mheinsen/seec,seec-team/seec,mheinsen/seec,mheinsen/seec,mheinsen/seec,seec-team/seec,seec-team/seec,seec-team/seec,seec-team/seec,mheinsen/seec