[MacPorts] #63608: openmpi/mpich: add support for clang12, and clang13 too if possible

[MacPorts]

#63608: openmpi/mpich: add support for clang12, and clang13 too if possible
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  Reporter:  mascguy        |      Owner:  mascguy
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  openmpi mpich  |
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Comment (by eborisch):

 See https://github.com/macports/macports-ports/pull/13416 for WIP port.
 Any reason not to push the green button?

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Ticket URL: <https://trac.macports.org/ticket/63608#comment:6>
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