[MacPorts] #70458: mpich, openmpi: add gcc14 and clang18 variants

[MacPorts]

#70458: mpich, openmpi: add gcc14 and clang18 variants
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  Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
      Type:  defect                          |     Status:  new
  Priority:  Normal                          |  Milestone:
 Component:  ports                           |    Version:
Resolution:                                  |   Keywords:
      Port:  mpich, openmpi, netcdf-fortran  |
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Comment (by mascguy):

 `openmpi` covered via just-merged PR:

 https://github.com/macports/macports-ports/pull/25859

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Ticket URL: <https://trac.macports.org/ticket/70458#comment:3>
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