[MacPorts] #56322: rust @1.26.0: buid failed on OS X <= 10.9

[MacPorts]

#56322: rust @1.26.0: buid failed on OS X <= 10.9
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  Reporter:  l2dy    |      Owner:  g5pw
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  rust    |
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Changes (by Ionic):

 * cc: ionic (added)


Comment:

 I'd use `clang-6.0`, since the universal builds already utilize
 `llvm-6.0`.

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Ticket URL: <https://trac.macports.org/ticket/56322#comment:22>
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