[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 nortcele):

 Oops, sorry. It was just a working copy. I've made  some housekeeping in
 my file and test it again.

 Here is a first version of the diffs. This diff contains changes for
 gcc-5.5 and changes to make the java compiler working again.

 After modification and test,  I'll post a second version without java
 support.

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:10>
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