[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>
--------------------+------------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  llvm-devel
--------------------+------------------------
 This llvm commit brought in new thread priority functions for Apple
 systems:

 https://github.com/llvm/llvm-
 project/commit/9902a0945d22cd5757b16ebe85fe07059723aa09

 the features used include those in <pthread/qos.h>, which is available
 from from macOS 10.10 onward.

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