mp3 and gzip functions in gnome-vfs

[Christophe Fergeau <teuf users sourceforge net>]

While looking at gnome-vfs code, I noticed it has
gnome_vfs_sniff_buffer_looks_like_mp3 and
gnome_vfs_sniff_buffer_looks_like_gzip functions in
gnome-vfs-mime-magic.c
This is really weird imo to have such functions in gnome-vfs, so I was
wondering if anyone knew if they were still useful, or if they could be
removed ? If nobody knows, I'll try to remove them and see what happens.

Christophe