gst/: Revert previous change until I figure out why it breaks distcheck.

gst/: Revert previous change until I figure out why it breaks distcheck.

Original commit message from CVS:
* gst/gst.c: (init_pre), (scan_and_update_registry),
(ensure_current_registry_nonforking),
(ensure_current_registry_forking), (ensure_current_registry),
(init_post), (gst_debug_help), (gst_deinit):
* gst/gst_private.h:
* gst/gstregistry.c: (gst_registry_finalize),
(gst_registry_remove_plugin), (gst_registry_scan_path_level),
(gst_registry_scan_path), (_gst_registry_remove_cache_plugins),
(_gst_registry_cleanup):
* gst/gstregistry.h:
Revert previous change until I figure out why it breaks distcheck.