Original commit message from CVS: * sys/v4l/gstv4lxoverlay.c: (gst_v4l_xoverlay_interface_init), (gst_v4l_xoverlay_set_xwindow_id): * sys/v4l2/gstv4l2xoverlay.c: (gst_v4l2_xoverlay_interface_init), (gst_v4l2_xoverlay_set_xwindow_id): Add debug categories, fix overlay disabling.