[MacPorts] #54949: gcc5 @5.4.0_2 fails to build on macOS 10.13

[MacPorts]

#54949: gcc5 @5.4.0_2 fails to build on macOS 10.13
-------------------------+------------------------
  Reporter:  matteopuel  |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  highsierra
      Port:  gcc5        |
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Changes (by nortcele):

 * Attachment "Portfile" added.

 draft Portfile for gcc 5.5 release candidate

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Ticket URL: <https://trac.macports.org/ticket/54949>
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