[MacPorts] #59069: portindex uses wrong cxx_stdlib for darwin 10, 11, 12?

[MacPorts]

#59069: portindex uses wrong cxx_stdlib for darwin 10,11,12?
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  Reporter:  ryandesign  |      Owner:  jmroot
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.6.0
Resolution:  fixed       |   Keywords:  haspatch
      Port:              |
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Comment (by jmroot):

 Actually the stdlib goes in the middle for some reason. See attached.

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Ticket URL: <https://trac.macports.org/ticket/59069#comment:4>
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