media-video/mpv: backport cpu usage fix with wayland clipboard

Kind of simple, so doing it straight-to-stable.

Closes: https://bugs.gentoo.org/959000
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

media-video/mpv/files/mpv-0.40.0-wayland-clipboard-cpu.patch

@@ -0,0 +1,16 @@
+https://bugs.gentoo.org/959000
+https://github.com/mpv-player/mpv/issues/16139
+https://github.com/mpv-player/mpv/pull/16140
+--- a/player/clipboard/clipboard-wayland.c
++++ b/player/clipboard/clipboard-wayland.c
+@@ -349,4 +349,10 @@
+         return false;
+ 
++    if (fds[2].revents & (POLLERR | POLLHUP | POLLNVAL))
++        destroy_offer(wl->selection_offer);
++
++    if (fds[3].revents & (POLLERR | POLLHUP | POLLNVAL))
++        destroy_offer(wl->primary_selection_offer);
++
+     if (fds[2].revents & POLLIN)
+         get_selection_data(wl, wl->selection_offer, false);

media-video/mpv/mpv-0.40.0-r3.ebuild

@@ -124,6 +124,10 @@ BDEPEND="
 	wayland? ( dev-util/wayland-scanner )
 "
 
+PATCHES=(
+	"${FILESDIR}"/${P}-wayland-clipboard-cpu.patch
+)
+
 pkg_pretend() {
 	if has_version "${CATEGORY}/${PN}[X,opengl]" && use !egl; then #953107
 		ewarn "${PN}'s 'opengl' USE was removed in favour of the 'egl' USE as it was"