NO_MKDTEMP is required to build, FREAD_READS_DIRECTORIES and the definition
of _LARGE_FILES fix test suite failures and INTERNAL_QSORT is required for
adequate performance.
Tested on AIX v5.3 Maintenance Level 06
Signed-off-by: Mike Ralphson <mike@abacus.co.uk> Tested-by: Johannes Sixt <johannes.sixt@telecom.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>