GTK+ has enabled by default support for Xinerama, but it's not a build
dependency so this can be enabled or disabled depending if xinerama has been
built previously.
This can cause problems with sstate, and result in situations where
PKG_CHECK_MODULES() for GTK+ can appear successful but the CFLAGS are not set.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
