Test for valid Wayland compositor before trying to shutdown.
Test for valid Wayland compositor before trying to shutdown.

Signed-off-by: Chris Michael <48d1b61d21f8504b6dc08474b224ab6407ac8581@comcast.net>

FlorentRevest/Enlightenment,rvandegrift/e,rvandegrift/e,tasn/enlightenment,FlorentRevest/Enlightenment,tasn/enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment