[MacPorts] #57612: clang does not respect -syslibroot when linking

[MacPorts]

#57612: clang does not respect -syslibroot when linking
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by kencu):

 and same with `macports-clang-5.0`, which is as far back as this Mojave
 behemoth can go in time.

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Ticket URL: <https://trac.macports.org/ticket/57612#comment:13>
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