The libiconv on Darwin uses the old iconv() interface (2nd argument is a
const char **, instead of a char **). Add OLD_ICONV to the Darwin
variable definitions to handle this.
Signed-off-by: Arjen Laarhoven <arjen@yaph.org> Acked-by: Brian Gernhardt <benji@silverinsanity.com> Signed-off-by: Junio C Hamano <junkio@cox.net>