[MacPorts] #58378: Qt5 CMake component fails under Xcode-10.2

[MacPorts]

#58378: Qt5 CMake component fails under Xcode-10.2
-------------------------+---------------------------------
  Reporter:  mouse07410  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
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Comment (by chrstphrchvz):

 Xcode being installed to /Applications/Xcode.app, although typical, is not
 universally the case. The user is free to place Xcode wherever and then
 select it with `sudo xcode-select -s /path/to/Xcode.app`. A common use
 case is to switch between multiple Xcode versions; GitHub Actions CI
 offers multiple Xcode versions located in /Applications, see e.g.
 [https://github.com/actions/virtual-
 environments/blob/fcb51fb/images/macos/macos-10.15-Readme.md#xcode].

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Ticket URL: <https://trac.macports.org/ticket/58378#comment:11>
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