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

[MacPorts]

#59069: portindex uses wrong cxx_stdlib for darwin 10,11,12?
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.6.0
Resolution:              |   Keywords:  haspatch
      Port:              |
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Comment (by jmroot):

 Yes the default should change now, but you can choose a stdlib in the
 platform specifier like `-p macosx_18_i386_libcxx`. So mprsyncup should
 probably explicitly choose.

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Ticket URL: <https://trac.macports.org/ticket/59069#comment:2>
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