t4201: use ISO8859-1 rather than ISO-8859-1
t4201: use ISO8859-1 rather than ISO-8859-1

Some ancient platforms do not have an extensive list of alternate names for
character encodings.  For example, Solaris 7 and IRIX 6.5 do 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 <77bc9a9984e6786c5799d7a71768cf023120ef76@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git