[MacPorts] #62770: clang++ 11 broken by MacOS 11.3 update

[MacPorts]

#62770: clang++ 11 broken by MacOS 11.3 update
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  Reporter:  haberg-1  |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur x86_64
      Port:  clang-11  |
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Comment (by landonf):

 See attached patch; it's a simple backport of the fix from
 https://reviews.llvm.org/D89001

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Ticket URL: <https://trac.macports.org/ticket/62770#comment:13>
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