tools/gst-inspect.c: Don't require decoder/demuxer/depayloader elements or encoder...

tools/gst-inspect.c: Don't require decoder/demuxer/depayloader elements or encoder/muxer/paylader elements to have 'C...

Original commit message from CVS:
* tools/gst-inspect.c:
(print_plugin_automatic_install_info_codecs):
Don't require decoder/demuxer/depayloader elements or
encoder/muxer/paylader elements to have 'Codec' as part of their
factory class string when introspecting a plugin's capabilities.
draft-klass.txt mentions that it might be removed in future, and
flump3dec doesn't have it as part of its class string, so chances
are others might also not have it.