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

[MacPorts]

#52200: Xcode 8 deprecation of xcrun breaks qt5 build
------------------------------------+------------------------
  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@…):

 {{{
 -    isEmpty($$list($$system("/usr/bin/xcrun -find xcrun 2>/dev/null"))):
 \
 +    isEmpty($$list($$system("/usr/bin/xcrun -find xcodebuild
 2>/dev/null"))): \
 }}}

 That will fail if the CommandLineTools are selected via xcode-select
 because they don't contain xcodebuild.  Does the build system actually
 require Xcode?  Or just the CLTools?

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Ticket URL: <https://trac.macports.org/ticket/52200#comment:6>
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