[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:
Resolution:               |   Keywords:
      Port:  mpich        |
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Description changed by mf2k:

Old description:

> Please add a mpich-gcc8 for mpich. maybe even mpich-gcc9 while you are at
> it.

New description:

 Please add a mpich-gcc8 sub-port for mpich. maybe even mpich-gcc9 while
 you are at it.

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Ticket URL: <https://trac.macports.org/ticket/56973#comment:1>
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