The splitting out of X11 plugins wasn't complete, which lead to no X11 plugins
being installed.
If the X11 distro feature is present, make gst-meta-base depend on
gst-meta-x11-base. Also make -x11-base RDEPEND on xvimagesink for video
playback performance.
[ YOCTO #3458 ]
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
