ext/gnomevfs/: Make gnomevfssink accept filenames as well as URIs for the "location" property, just like gnomevfssrc ...

Original commit message from CVS:
* ext/gnomevfs/gstgnomevfs.c:
(gst_gnome_vfs_location_to_uri_string):
* ext/gnomevfs/gstgnomevfs.h:
* ext/gnomevfs/gstgnomevfssink.c:
(gst_gnome_vfs_sink_set_property):
* ext/gnomevfs/gstgnomevfssrc.c: (gst_gnome_vfs_src_set_property):
Make gnomevfssink accept filenames as well as URIs for the
"location" property, just like gnomevfssrc does (and
filesrc/filesink do) (#336190).