Use non-mutable default for names in binary_distribution::get_specs call (#14696)
Use non-mutable default for names in binary_distribution::get_specs call (#14696)

* Use non-mutable default for names

* Make suggested change

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