adol-c: add boost optional dependency (#7905)
adol-c: add boost optional dependency (#7905)


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