* test PIGLIT_BUILD_GL_TESTS depend on glx library, so depend
on x11, so respect the DISTRO_FEATURES, only enable it when
x11 is enabled.
* mesa-demos depend on libGL.so which is provide by recipe
mesa, but when x11 is disabled, libGL.so is not generated.
so we can only rdepend on this when x11 is enabled
* add x11 PACKAGECONFIG to add correct config/depend/rdepend
[YOCTO #6077]
Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
