Cloog fixes

Currently Cloog is not used by gcc in lunar. Even if you say yes to cloog (gcc won't error out, it just doesn't use it). My fixes will make gcc use cloog again, if the user decides to add it -> cloog-ppl should be removed after this fixes are included in core.

By the way: You can (and NEED to) test if cloog works, by trying to compile something with: "-floop-parallelize-all -ftree-parallelize-loops=2" - That'll only work if gcc correctly found cloog.