This augments 3632cfc24 (Use compatibility regex library on Darwin,
2008-09-07), which already carries a "Tested-by" statement for AIX,
but that test was actually done with this patch included.
Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at> Tested-by: Mike Ralphson <mike@abacus.co.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>