ppcg ebuild

Created ebuild for Sven Verdoolaege's ppcg compiler. I got tired of linking individual files give you the chance to browse whole directory of 3 files, and you only need one of them (ebuild) unless Sven's files at repo.or.cz are not available.

Place ppcg-20140207.ebuild info /your/private/overlay/sys-devel/ppcg.

By default two executables will be installed (that is ppcg and pet). If you don't need the latter, set USE flag no_pet when emerging.

Test not implemented. I will enable it if I find a known-to-work C to CUDA example.