Boost: fixed problem when requesting ~signals for boost >= 1.69 (#12627)
Boost: fixed problem when requesting ~signals for boost >= 1.69 (#12627)

* fixed problem when requesting ~signals for boost >= 1.69

* added checks for all libs in with_libs

iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack