[MacPorts] #47426: Add OpenCoarrays dependency for gcc5

[MacPorts]

#47426: Add OpenCoarrays dependency for gcc5
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  Reporter:  damian@…  |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:
      Port:  gcc5      |
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Comment (by damian@…):

 Is this likely to happen.  Also, the OpenCoarrays port would need to have
 an MPI library designated as a dependency.  The preferred MPI is MPICH for
 which I believe a port already exists.

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Ticket URL: <https://trac.macports.org/ticket/47426#comment:3>
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