gst/typefind/gsttypefindfunctions.c: Fix CMML type find function to not require a specific minor version of the CMML ...

Original commit message from CVS:
* gst/typefind/gsttypefindfunctions.c: (mpeg4_video_type_find),
(cmml_type_find), (plugin_init):
Fix CMML type find function to not require a specific minor version
of the CMML header.

Add an MPEG4 video elementary stream typefind function.