[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
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  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):

 There is a note in the `qt5-qtcreator` Portfile now that parallel building
 was previously disabled to avoid a `make write error` so it seems possible
 that this error has in fact been seen before.

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Ticket URL: <https://trac.macports.org/ticket/58418#comment:5>
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