Instead of several variables and overrides, use PACKAGECONFIG to respect X11 and
systemd DISTRO_FEATURES.
(From OE-Core rev: 963da99c77ad28bd184a4de59af9cbcfaef62358)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>