[MacPorts] #54754: qt5-qtbase @5.8.0_0 fails to build on MacOS 10.13

[MacPorts]

#54754: qt5-qtbase @5.8.0_0 fails to build on MacOS 10.13
-------------------------+---------------------------------
  Reporter:  rex4539     |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.99
Resolution:              |   Keywords:  highsierra
      Port:  qt5-qtbase  |
-------------------------+---------------------------------
Changes (by bertrandrustle):

 * Attachment "macports_qt5-qtbase_fix-bug-54754.diff" added.

 Portfile patch incorporating the patch from upstream. Applying this in a
 local repo copy of the port directory fixes the build.

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Ticket URL: <https://trac.macports.org/ticket/54754>
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