[MacPorts] #57130: clang-7.0: build fails in compiler-rt/lib/xray on darwin < 15 due to several issues

[MacPorts]

#57130: clang-7.0: build fails in compiler-rt/lib/xray on darwin < 15 due to
several issues
------------------------+----------------------
  Reporter:  kencu      |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-7.0  |
------------------------+----------------------

Comment (by kencu):

 A moderately complex replacement for clock_gettime() with an MIT license:
 <https://gist.github.com/alfwatt/3588c5aa1f7a1ef7a3bb>.

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Ticket URL: <https://trac.macports.org/ticket/57130#comment:4>
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