libevent: remove unused patch

libevent/warn-if-forked-from-the-event-loop.patch

@@ -1,32 +0,0 @@
-From b75922ae5b6d7bea6ef2f53618dca6c5760c71b4 Mon Sep 17 00:00:00 2001
-From: Azat Khuzhin <azat@libevent.org>
-Date: Mon, 1 Jul 2019 23:54:02 +0300
-Subject: [PATCH] Warn if forked from the event loop during event_reinit()
-
-Calling fork() from the event loop is not a great idea, since at least
-it shares some internal pipes (for handling signals) before
-event_reinit() call
-
-Closes: #833
-(cherry picked from commit 497ef904d544ac51de43934549dbeccce8e6e8f8)
----
- event.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
-diff --git a/event.c b/event.c
-index bfd94ebd0..b2ad34102 100644
---- a/event.c
-+++ b/event.c
-@@ -987,6 +987,12 @@ event_reinit(struct event_base *base)
- 
- 	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
- 
-+	if (base->running_loop) {
-+		event_warnx("%s: forked from the event_loop.", __func__);
-+		res = -1;
-+		goto done;
-+	}
-+
- 	evsel = base->evsel;
- 
- 	/* check if this event mechanism requires reinit on the backend */