Report thread_id as unsigned long.

src/srun/launch.c

@@ -250,7 +250,8 @@ static int _check_pending_threads(thd_t *thd, int count)
 	for (i = 0; i < count; i++) {
 		thd_t *tp = &thd[i];
 		if ((tp->state == DSH_ACTIVE) && ((now - tp->tstart) >= 2) ) {
-			debug2("sending SIGALRM to thread %d", tp->thread);
+			debug2("sending SIGALRM to thread %lu", 
+				(unsigned long) tp->thread);
 			/*
 			 * XXX: sending sigalrm to threads *seems* to
 			 *  generate problems with the pthread_manager