Also handle the extensions .tlz and .txz, aliases for .tar.lzma and
.tar.xz respectively.
Signed-off-by: Ingmar Vanhassel <ingmar@exherbo.org> Liked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>