[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 jeremyhu@…):

 xcrun wasn't deprecated in Xcode 8, it was removed.  It was removed from
 within Xcode.app because it was redundant to the system-provided version.

 That particular `reinplace` isn't optimal.  You should be replacing
 `/usr/bin/xcrun -find xcrun` with `/usr/bin/xcrun` rather than
 `/usr/bin/xcrun -find /usr/bin/xcrun`

 Also, this should be done as a patch instead of a `reinplace` and
 upstreamed to benefit others.

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Ticket URL: <https://trac.macports.org/ticket/52200#comment:3>
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