cloog-ppl: removing because obsolete

cloog-ppl is obsolete and replaced with cloog (which gets into core)
once https://github.com/lunar-linux/moonbase-core/pull/360 got
accepted, remove cloog-ppl. It's not used anyway (even if you say
yes to it at gcc - it won't be used)
Merge pull request #53 from chani/obsolete-cloog-ppl

cloog-ppl: removing because obsolete