cgal: added version 4.12 (#8252)
cgal: added version 4.12 (#8252)


matthiasdiener/spack,krafczyk/spack,tmerrick1/spack,LLNL/spack,iulian787/spack,LLNL/spack,mfherbst/spack,LLNL/spack,matthiasdiener/spack,iulian787/spack,mfherbst/spack,tmerrick1/spack,mfherbst/spack,tmerrick1/spack,krafczyk/spack,tmerrick1/spack,iulian787/spack,matthiasdiener/spack,krafczyk/spack,iulian787/spack,krafczyk/spack,matthiasdiener/spack,mfherbst/spack,LLNL/spack,matthiasdiener/spack,krafczyk/spack,LLNL/spack,iulian787/spack,tmerrick1/spack,mfherbst/spack