[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
 Keywords:              |       Port:
------------------------+--------------------
 Now that MacPorts 2.6.0 uses libc++ for darwin 10,11,12, isn't portindex
 doing the wrong thing on those versions?

 https://github.com/macports/macports-
 base/blob/master/src/port/portindex.tcl#L224

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