[Bug middle-end/64017] Support ISL 0.14.0 (to fix ICE with gfortran.dg/graphite/pr42393.f90)

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64017

--- Comment #5 from howarth at bromo dot med.uc.edu ---
Do we still need to be passing -DCLOOG_INT_GMP from config/isl.m4 now that the
cloog support is fully deprecated in gcc 5.0?