libx11: skip self if x11 not in DISTRO_FEATURES

This stops (most) x11 packages leaking into a non-x11 distro by mistake.

Signed-off-by: Phil Blundell <philb@gnu.org>

The patch was imported from the oe-core git server
(git://git.openembedded.org/openembedded-core) as of commit id
2f94ff4fdb66755ba2448794baea19315ff96273.

Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

meta-oe/recipes-graphics/xorg-lib/libx11.inc

@@ -45,3 +45,8 @@ do_compile_prepend() {
 		cd ../../
 	) || exit 1
 }
+
+python () {
+       if not oe.utils.contains ('DISTRO_FEATURES', 'x11', True, False, d):
+       	  raise bb.parse.SkipPackage("X11 not enabled for this DISTRO")
+}