[MacPorts] #64827: Remove a ban of gcc10 in mpi Port group

[MacPorts]

#64827: Remove a ban of gcc10 in mpi Port group
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.7.2
Resolution:                |   Keywords:  mpi
      Port:  mpich         |
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Comment (by kencu):

 I don't want to complicate the discussion overly:

 gcc10 is not available in MacPorts on < 10.6.

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Ticket URL: <https://trac.macports.org/ticket/64827#comment:3>
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