x11 is actually always present in native DISTRO_FEATURES, and
so it's fine to require it in all cases.
(From OE-Core rev: 1d9f1da619089fc8edee027261b1fbe2e673091b)
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>