ext/gnomevfs/gstgnomevfssrc.*: Remove ICY handling (mostly) from gnomevfssrc, in favour of proper shared support with...

Original commit message from CVS:
* ext/gnomevfs/gstgnomevfssrc.c: (gst_gnome_vfs_src_class_init),
(gst_gnome_vfs_src_init), (gst_gnome_vfs_src_finalize),
(gst_gnome_vfs_src_get_property),
(gst_gnome_vfs_src_send_additional_headers_callback),
(gst_gnome_vfs_src_received_headers_callback),
(gst_gnome_vfs_src_create), (gst_gnome_vfs_src_start),
(gst_gnome_vfs_src_stop):
* ext/gnomevfs/gstgnomevfssrc.h:
Remove ICY handling (mostly) from gnomevfssrc, in favour of
proper shared support within icydemux.