[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:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:  clang-9.0  |       Port:  clang-9.0
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 clang-9.0 is failing to build on Big Sur macOS 11.0.1 Xcode 12.2

 Log file attached

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