[hpx] Two new variants for upcoming v1.5, stable and master (#18022)
[hpx] Two new variants for upcoming v1.5, stable and master (#18022)

* New package: cxxopts

* Use +unicode instead of unicode=True

- Make the unicode option more explicit

* Add two new variants to spack for upcoming 1.5, stable and develop

* Add as maintainer

* Add depends_on on clauses

* Remove unrelated change
LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack