Original commit message from CVS:
* sys/glsink/gstvideo-common.c:
* sys/glsink/gstvideo-common.h:
Pull together some common raw video functions into one location.
This should eventually move to -base.
* sys/glsink/Makefile.am:
* sys/glsink/glimagesink.c:
* sys/glsink/glimagesink.h:
* sys/glsink/glvideo.c:
* sys/glsink/glvideo.h:
* sys/glsink/gstopengl.c:
Use the new video-common.h stuff. Readd support for RGB video.
