gdk-pixbuf: Add --with-x11 when building lsb image
LSB Test Suite complains "No library libgdk_pixbuf_xlib-2.0.so.0" \
because of having "--without-x11" for gdk-pixbuf_2.24.1.bb.
Use the linuxstdbase override and also make it conditional on x11 \
being in DISTRO_FEATURES for passing lsb test.
Split libgdk_pixbuf_xlib to a single package.
Signed-off-by: Xiaofeng Yan <xiaofeng.yan@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
