complibs: add ISL

ISL is used by gcc-4.8 onward for GRAPHITE, so is also used as
backend for CLooG 0.18.0 onward.

Reported-by: "Plotnikov Dmitry" <leitz@ispras.ru>
[Dmitry did a preliminray patch to add ISL, which this one is inspired from]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

#!/bin/sh

set -e

printf "Running autoconf...\n"

autoconf -Wall --force

printf "Done. You may now run:\n    ./configure\n"