gst/gstplugin.*: Add the 3-clause BSD license and the MIT/X11 license to the license list. Fixes #479784.

Original commit message from CVS:
* gst/gstplugin.c:
* gst/gstplugin.h:
Add the 3-clause BSD license and the MIT/X11 license to the license
list. Fixes #479784.
3 files changed