Use GST_LICENSE, GST_PACKAGE_NAME and GST_PACKAGE_ORIGIN instead of hardcoding values where possible. Fixes bug #522212.

Original commit message from CVS:
* ext/alsaspdif/alsaspdifsink.c:
* ext/gsm/gstgsm.c:
* ext/jack/gstjack.c:
* ext/libmms/gstmms.c:
* ext/neon/gstneonhttpsrc.c:
* ext/shout/gstshout.c:
* ext/timidity/gsttimidity.c:
* ext/timidity/gstwildmidi.c:
* gst/nuvdemux/gstnuvdemux.c:
* gst/tta/gsttta.c:
Use GST_LICENSE, GST_PACKAGE_NAME and GST_PACKAGE_ORIGIN instead
of hardcoding values where possible. Fixes bug #522212.