acl: Update to 2.3.1

acl: Update to 2.3.1

- Update from 2.2.53 to 2.3.1
- Updated rootfile
- Changelog
   Version 2.3.1
    Fix libtool library versioning regression	Andreas Gruenbacher
   Version 2.3.0
    Update po files and German translation	Andreas Gruenbacher
    getfacl: fix indent in --help output	Valentin Vidic
    getfacl: Add --one-file-system optionnext	Pavel Polacek
    Move struct stat into struct walk_tree_args	Andreas Gruenbacher
    Move list of open directories into struct walk_tree_args	Andreas Gruenbacher
    Move walk_tree_rec arguments into a separate struct	Andreas Gruenbacher
    acl_from_mode, acl_copy_int: Fix segfault on allocation failure	Tavian Barnes
    __acl_create_entry_obj: do not break strict aliasing rules	Kamil Dudka
    Fix typo in getfacl(1) man page	Anthony Sottile

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>