[MacPorts] #56973: mpich: Add mpich-gcc8

[MacPorts]

#56973: mpich: Add mpich-gcc8
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 Reporter:  mf2k         |      Owner:  eborisch
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  mpich
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 Please add a mpich-gcc8 for mpich. maybe even mpich-gcc9 while you are at
 it.

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Ticket URL: <https://trac.macports.org/ticket/56973>
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