dealii: support 64bit BLAS (#6758)
dealii: support 64bit BLAS (#6758)


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