[MacPorts] #58418: qt5-qtcreator fails to build on Mojave with Xcode-10.2.1

[MacPorts]

#58418: qt5-qtcreator fails to build on Mojave with Xcode-10.2.1
----------------------------+---------------------------------
  Reporter:  mouse07410     |      Owner:  MarcusCalhoun-Lopez
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  qt5-qtcreator  |
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Comment (by kencu):

 `qt5-qtcreator` is broken for me on 10.13 as well, with the error seen in
 [ticket:58424]. It seems likely the recent `qbs` upgrade broke it.

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Ticket URL: <https://trac.macports.org/ticket/58418#comment:3>
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