Some ancient platforms do not have an extensive list of alternate names for
character encodings. For example, Solaris 7 does not know that ISO-8859-1
is the same as ISO8859-1. Modern platforms do know this, so use the older
name.
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>