Relatively simplistic implementations of ResumeThread (stub) and
SignalObjectAndWait (bAlertable is ignored). Both are needed for ProRes 4:2:2
support on Linux.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30861 b3059339-0415-0410-9bf9-f77b7e298cf2