Example of how to properly ignore methods that aren't available if some feature is...

Example of how to properly ignore methods that aren't available if some feature is disabled in GStreamer core.

Original commit message from CVS:
* configure.ac:
* gst/Makefile.am:
* gst/gst-disable-loadsave.ignore:
* gst/gstversion.override.in:
Example of how to properly ignore methods that aren't available if
some feature is disabled in GStreamer core.