[MacPorts] #52200: Xcode 8 deprecation of xcrun breaks qt5 build

[MacPorts]

#52200: Xcode 8 deprecation of xcrun breaks qt5 build
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  Reporter:  howarth.at.macports@…  |      Owner:  mcalhoun@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:  sierra
      Port:  qt5                    |
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Comment (by raimue@…):

 I attached the patch in compatible format (`-p0`). However, there are so
 many subports in this Portfile that I am not sure where this needs to be
 added to `patchfiles`.

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Ticket URL: <https://trac.macports.org/ticket/52200#comment:5>
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