[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:  legacy-os
      Port:  rust    |
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Comment (by nihilus):

 Replying to [comment:20 nihilus]:
 > This bug kinda pissed me off, and the solution is trivial when one knows
 the problem.
 > Just set configure.compiler = macports-clang and viola, problem solved.
 Now I did a selfupdate and I don't see this having been fixed. Instead it
 is falling back on the default toolchain. See this as a lesson learned for
 future portfiles.

 For every one, this is the solution that works so please fix this
 upstream.

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Ticket URL: <https://trac.macports.org/ticket/56322#comment:33>
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