[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):

 Ken, is there a specific reason why this patch is not safe to apply for
 all versions of Xcode?

 BYUMcKay, pdftk doesn't attempt to use gcc5; it attempt to use gcc47, and
 fails as described in #48528.

 nortcele, please file a new ticket for the Java issues. If you've really
 found a way to make gcj work with gcc5, that would be great, since it
 might let me finally fix the pdftk port. To my knowledge, we only have
 working gcj in gcc45 and gcc47 now, and those don't work on the latest
 macOS versions.

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:13>
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