Do not call event_del() for signals after fork(), just use sigaction()

directly instead - calling libevent functions after fork() w/o
event_reinit() is a bad idea, even if in this case it was harmless.

job.c

@@ -149,7 +149,7 @@ job_run(struct job *job)
 	case -1:
 		return (-1);
 	case 0:		/* child */
-		clear_signals();
+		clear_signals(1);
 
 		environ_push(&global_environ);