A final and proper fix for HP-UX problems with pthread_cond_timedwait.

This time I did it "by the book" as this function can return any 
of the down cited values after timeout !! This is now done 100 %
according to HP-UX DCE documentation.

This made Hewlett-Packard very happy.

mysys/my_pthread.c

@@ -420,7 +420,7 @@ int my_pthread_cond_timedwait(pthread_cond_t *cond,
 			      struct timespec *abstime)
 {
   int error=pthread_cond_timedwait(cond,mutex,abstime);
-  return error == EAGAIN ? ETIMEDOUT : error;
+  return (error == EAGAIN || error == -1) ? ETIMEDOUT : error;
 }
 #endif /* HAVE_BROKEN_PTHREAD_COND_TIMEDWAIT */