[MacPorts] #65626: llvm-devel @20220731: build fails on < 10.10 due to lack of <pthread/qos.h>

[MacPorts]

#65626: llvm-devel @20220731: build fails on < 10.10 due to lack of <pthread/qos.h>
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  Reporter:  kencu       |      Owner:  cjones051073
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  llvm-devel  |
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Comment (by cjones051073):

 llvm-15 is now also affected by this.

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Ticket URL: <https://trac.macports.org/ticket/65626#comment:2>
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