[MacPorts] #63608: openmpi/mpich: add support for clang12

[MacPorts]

#63608: openmpi/mpich: add support for clang12
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 Reporter:  mascguy      |      Owner:  mascguy
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  openmpi mpich
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 Since MacPorts Clang 12 has had time to mature, it's worth testing both
 `openmpi` and `mpich` to see if they'll build and function with it.

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