libx11: skip self if x11 not in DISTRO_FEATURES

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

(From OE-Core rev: 2f94ff4fdb66755ba2448794baea19315ff96273)

Signed-off-by: Phil Blundell <philb@gnu.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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

@@ -42,3 +42,8 @@ do_compile() {
 # Multiple libx11 derivatives from from this file and are selected by virtual/libx11
 # A world build should only build the correct version, not all of them.
 EXCLUDE_FROM_WORLD = "1"
+
+python () {
+       if not oe.utils.contains ('DISTRO_FEATURES', 'x11', True, False, d):
+       	  raise bb.parse.SkipPackage("X11 not enabled for this DISTRO")
+}