In order to move composite inside the core we need to kill the
use_composite option. However in some places it is being used to switch
between ARGB and shaped windows. It doesn't make much sense to keep the
advanced/engine dialog to let the user toggle this options if we have
composite always enabledm, but lets allow the user to shoot
himself on the foot (for now).
Next step will be to move the comp module files to core so user can't
unload it anymore.
SVN revision: 82433
Lucas De Marchi
Mike Blumenkrantz