[MacPorts] #47553: compilers portgroup: add option for gcc5

[MacPorts]

#47553: compilers portgroup: add option for gcc5
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  Reporter:  ryandesign@…  |      Owner:  sean@…
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:  compilers     |
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Comment (by sean@…):

 Replying to [comment:11 mmoll@…]:
 > You probably need to make corresponding changes in the openmpi-* ports.
 For example, `port install arrack +gcc5 +openmpi` won't work currently.
 Should I file a separate ticket for that?

 I was waiting on #47541 to complete, then I'd copy Eric's work into
 openmpi :-)

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Ticket URL: <https://trac.macports.org/ticket/47553#comment:12>
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