[climbfuji]

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Description

Update nvhpc to 26.9 on Bounty (@climbfuji's dev system), and remove old compiler configs.

Includes submodule pointer update for repos/builtin: JCSDA/spack-packages#106

Dependencies

• hdf5@2.1.x: HL Fortran doesn't see MPI_Fortran_INCLUDE_DIRS spack-packages#106

Issues addressed

None

Applications affected

None

Systems affected

Bounty

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • ...

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged