* exceptions.cc (pending_signals): Remove unneeded declaration.

* sigproc.cc (pending_signals): Make static.
(wait_sig): Use defined values rather than integers for rc.  Never scan both
todo arrays as this could cause hangs if signals arrive from two different
sources.  Rename saw_pending_signals to saw_failed_interrupt.  Exit loop when
signal found.  Enter low-priority sleep, if necessary, after finished
signalling completion.  Set pending_signals when blocked
(from Pierre Humblet).

winsup/cygwin/exceptions.cc

@@ -591,7 +591,6 @@ handle_sigsuspend (sigset_t tempmask)
 }
 
 extern DWORD exec_exit;		// Possible exit value for exec
-extern int pending_signals;
 
 extern "C" {
 static void