Import isl-0.11.1 as math/isl, packaged for wip by Kai-Uwe Eckhardt.

isl is a library for manipulating sets and relations of integer
points bounded by linear constraints. Supported operations on sets
include intersection, union, set difference, emptiness check, convex
hull, (integer) affine hull, integer projection, and computing the
lexicographic minimum using parametric integer programming. It also
includes an ILP solver based on generalized basis reduction.
+ isl
Added math/isl version 0.11.1
Use math/isl instead of builtin copy of the same.
Add TEST_TARGET. Use gmp.
Bump PKGREVISION.

From Kai-Uwe Eckhardt.
Updated math/cloog to 0.18.0nb1
Correct dependencies. No users yet, so no bumps needed.