x11-misc/xbindkeys: Add release event status mask patch.

x11-misc/xbindkeys: Add release event status mask patch.

Add and make apply a patch to x11-misc/xbindkeys, which applies mask
to release event status fixing layout issues.

The patch is actually merged to xbindkeys upstream, but no new version
is released since then.

Closes: https://bugs.gentoo.org/548000.
Closes: https://github.com/gentoo/gentoo/pull/12938

Reference: https://askubuntu.com/a/825622
Reference: https://lists.nongnu.org/archive/html/xbindkeys-devel/2014-02/msg00002.html

Signed-off-by: Alexey Chernov <4ernov@gmail.com>
Signed-off-by: Benda Xu <heroxbd@gentoo.org>