[MacPorts] #52776: clang build fails due to __SWIFT_UNAVAILABLE_MSG used in the SDK but not defined for some reason

[MacPorts]

#52776: clang build fails due to __SWIFT_UNAVAILABLE_MSG used in the SDK but not
defined for some reason
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  Reporter:  murrayE    |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:
      Port:  clang-3.8  |
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Comment (by ken-cunningham-webuse):

 here's the ticket that got that started, I believe [ticket:48471}

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Ticket URL: <https://trac.macports.org/ticket/52776#comment:8>
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