[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        |
-------------------------+------------------------

Comment (by ken-cunningham-webuse):

 In [changeset:"1e1ee55c3e8eebf2eb6756fae5c1872ba2481b2c/macports-ports"
 1e1ee55c3e8eebf2eb6756fae5c1872ba2481b2c/macports-ports]:
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="1e1ee55c3e8eebf2eb6756fae5c1872ba2481b2c"
 gcc5: fix build with xcode 9+

 see: https://trac.macports.org/ticket/54949
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:12>
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