gtk run over x11 at current OE-core. If gtk want to run over directfb, then \
the configuration related to x11 should be disabled and directfb should be enabled.
[YOCTO #1674]
(From OE-Core rev: c95e859672599e43e156ac12dc1d919e0dd34510)
Signed-off-by: Xiaofeng Yan <xiaofeng.yan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>