Add symlink, mtime and label support to AtheFS.
* fs/afs.c (grub_afs_sblock): Declare `name' as char.
(grub_afs_iterate_dir): Handle symlinks.
(grub_afs_open): Use grub_afs_read_symlink.
(grub_afs_dir): Likewise.
Pass mtime.
(grub_afs_label): New function.
(grub_afs_fs): Add grub_afs_label.
(grub_afs_read_symlink): New function.