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

[MacPorts]

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

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Pushed as r136118.

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Ticket URL: <https://trac.macports.org/ticket/47553#comment:10>
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