check/Makefile.am: Fix environment variables.

check/Makefile.am: Fix environment variables.

Original commit message from CVS:
* check/Makefile.am: Fix environment variables.
* check/gst/gstplugin.c: Fix for API changes.
* tools/gst-inspect.c: Fix for API changes.
* tools/gst-xmlinspect.c: Fix for API changes.
* gst/gstelementfactory.c:
* gst/gstplugin.c:
* gst/gstplugin.h:
* gst/gstpluginfeature.c:
* gst/gstpluginfeature.h:
* gst/gstregistry.c:
* gst/gstregistry.h:
* gst/gstregistryxml.c:
* gst/gsttypefind.c:
* gst/gsttypefindfactory.c:
* gst/indexers/gstfileindex.c:
* gst/indexers/gstmemindex.c:
* gst/schedulers/Makefile.am:
Change registry to keep track of both plugins and features,
removing the feature tracking from plugins themselves.