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

[MacPorts]

#58378: Qt5 CMake component fails under Xcode-10.2
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  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 mouse07410):

 Based on my experience of several years, the **only** guarantee about
 Xcode one can make is that it's located in {{{/Applications/Xcode.app}}},
 and it's Command Line Tools counterpart (if installed or present - it may
 not be!) is in {{{/Library/Developer/CommandLineTools}}}.

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Ticket URL: <https://trac.macports.org/ticket/58378#comment:9>
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