Original commit message from CVS:
2005-10-27  Julien MOUTTE  <julien@moutte.net>

* gst/videobox/gstvideobox.c: (gst_video_box_class_init),
(gst_video_box_transform_caps), (gst_video_box_set_caps),
(gst_video_box_get_unit_size), (gst_video_box_copy_plane_i420),
(gst_video_box_i420), (gst_video_box_ayuv): Use liboil for
I420 rendering as well, doesn't bring much for my platform.
Might help on some other platforms.