[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
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  Reporter:  matteopuel  |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  highsierra
      Port:  gcc5        |
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Comment (by ryandesign):

 Yeah, I noticed that too. Here's the log from the buildbot:

 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/1170

 We've already marked gcc49 and earlier incompatible with High Sierra.
 Simplest would be to mark gcc5 incompatible too. gcc6 and later build fine
 on High Sierra.

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:1>
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