dev-libs/libevent: Clean up/properly name patch.

Package-Manager: portage-2.2.23

dev-libs/libevent/files/libevent-2.1.5-event_signals_ordering.patch

@@ -1,5 +1,3 @@
-diff --git a/event.c b/event.c
-index acef2b2..ad4c7f0 100644
 --- a/event.c
 +++ b/event.c
 @@ -926,13 +926,13 @@ event_reinit(struct event_base *base)

dev-libs/libevent/libevent-2.1.5-r4.ebuild

@@ -36,7 +36,7 @@ S=${WORKDIR}/${MY_P}
 
 src_prepare() {
 	elibtoolize
-	epatch "${FILESDIR}/event_signals_ordering.patch"
+	epatch "${FILESDIR}/${PN}-2.1.5-event_signals_ordering.patch"
 	# don't waste time building tests
 	# https://github.com/libevent/libevent/pull/144
 	sed -i -e '/^all:/s|tests||g' Makefile.nmake || die