[MacPorts] #56322: rust @1.25.0: buid failed on OS X <= 10.9

[MacPorts]

#56322: rust @1.25.0: 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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Comment (by l2dy):

 Replying to [comment:2 pmetzger]:
 > Zero King, are you working on this?

 No, I don't have an old OS X environment. But I could revert the change
 for older systems by adding an `if` block.

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Ticket URL: <https://trac.macports.org/ticket/56322#comment:3>
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