Cleanup smith spack pkg

[chapman39]

• update mfem, enzyme, spack and spack-packages
• cleanup smith spack package in order to eventually push it up to spack
  • adds new smith version
  • removes outdated/ repeated sections
• move forwarding spack variants to defaults.yaml
• upgrade cmake to version 4+ on docker containers and mac mini (simplifies mac mini guide a bit)

Related PRs

• MFEM: Add lib64 path to netlib-scalapack spack/spack-packages#5314
• Raja stream fix mfem/mfem#5383

Some problems...

if ~~shared, probably can't use certain libs as external

==> Error: failed to concretize `smith@develop+adiak+caliper+devtools+enzyme~openmp~~shared %[when='%fortran'] fortran=gcc@15 %[when='%c'] c=clang@19 %[when='%cxx'] cxx=clang@19 %[when='%mpi'] openmpi@5.0.9.clang_19` for the following reasons:
     1. Cannot build python, since it is configured `buildable:false` and no externals satisfy the request
     2. Cannot build py-sphinx, since it is configured `buildable:false` and no externals satisfy the request
     3. Cannot build lua, since it is configured `buildable:false` and no externals satisfy the request

workaround: propagate flag manually to important tpls in spec ^mfem~shared ^axom~shared ...

[white238]

It is going to be hard to release this to spack-packages unless our releases have actual releases from mfem/axom/etc.... not sure what to do with that given we track their develop so closely.

[chapman39]

thats a good point.. we'd have to wait until dependencies properly release the version we need, which might be hard to track

[white238]

Overall this looks great. Thanks for the hard work @chapman39 !

[btalamini]

Very cool that the Mac mini build can use the Homebrew cmake. That will make the startup for new mac users easier.