[MacPorts] #47546: gcc5: update to 5.1

[MacPorts]

#47546: gcc5: update to 5.1
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  Reporter:  anders@…  |      Owner:  ryandesign@…
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc5      |
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Comment (by anders@…):

 Thanks for the info on the new GCC numbering scheme.
 And thanks to all of you for maintaining the GCC ports. Greatly
 appreciated!

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Ticket URL: <https://trac.macports.org/ticket/47546#comment:5>
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