libevent: revert patch that breaks among others links

see https://archives.seul.org/libevent/users/Aug-2019/msg00009.html

libevent/.signature

@@ -1,5 +1,6 @@
 untrusted comment: verify with /etc/ports/opt.pub
-RWSE3ohX2g5d/fBdVwxB4fwK25yHkNVXcItl/mzJXCHcJSCg0ewVj0Rt+G7s2/aWmUHQ+iigthCpMEnD5RMQ1ycVuxEdOdw9Xgw=
-SHA256 (Pkgfile) = 9c3782df5fadb2c79f3e5f048421e77a61dd7cbc9b215aaacfde2e52fe26371f
+RWSE3ohX2g5d/bpDGRTMaXUPr34Sp82fpdN2p48I9C9pn8nLvXRIIN1szuaRDmF5DpET3w9Uy7zNLZYC8pDak5JXVxnMnE7hmQs=
+SHA256 (Pkgfile) = 85c6bb7234edbcf84a545468e7df4531e182c29ea8a5661fb71b887155ee79cf
 SHA256 (.footprint) = 737d7bae7a37238124f43945d6feab1daca1888d1b735e20d981784916782a6a
 SHA256 (libevent-2.1.11-stable.tar.gz) = a65bac6202ea8c5609fd5c7e480e6d25de467ea1917c08290c521752f147283d
+SHA256 (warn-if-forked-from-the-event-loop.patch) = 91572f51556e641b1eff864075cf40b4bb5b0c2fc16f45ab1872e16a391792ad

libevent/Pkgfile

@@ -5,11 +5,16 @@
 
 name=libevent
 version=2.1.11
-release=1
-source=(https://github.com/libevent/libevent/releases/download/release-$version-stable/$name-$version-stable.tar.gz)
+release=2
+source=(https://github.com/libevent/libevent/releases/download/release-$version-stable/$name-$version-stable.tar.gz
+        warn-if-forked-from-the-event-loop.patch)
 
 build() {
     cd $name-$version-stable
+
+    # https://archives.seul.org/libevent/users/Aug-2019/msg00009.html
+    patch -p1 -R -i $SRC/warn-if-forked-from-the-event-loop.patch
+    
     ./configure --prefix=/usr
     make
     make DESTDIR=$PKG install

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

@@ -0,0 +1,32 @@
+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 */