[MacPorts] #61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2

[MacPorts]

#61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2
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  Reporter:  jhoyt4     |      Owner:  kencu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-9.0  |
------------------------+----------------------

Comment (by kencu):

 {{{/usr/include/sys/stat.h}}} is virtually identical better the 10.15 SDK
 and the 11.0 SDK, so the answer is not obvious there...

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Ticket URL: <https://trac.macports.org/ticket/61477#comment:16>
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