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

[MacPorts]

#64827: Remove a ban of gcc10 in mpi Port group
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  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.7.2
Resolution:                |   Keywords:  mpi
      Port:  mpich         |
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Comment (by barracuda156):

 Replying to [comment:4 kencu]:
 > A separate issue is that the mpi portgroup may or may not need to update
 what it thinks is supported on 10.6 and 10.7, as it looks like that might
 be out of date.

 You are right, and I in fact meant this (this assumption of `mpi`
 portgroup caused an error that I referred to).

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Ticket URL: <https://trac.macports.org/ticket/64827#comment:6>
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