[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:  jmroot
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.6.0
Resolution:  fixed       |   Keywords:  haspatch
      Port:              |
-------------------------+----------------------

Comment (by ryandesign):

 There's no need for mprsyncup to change, with the above fix already
 applied to portindex.

 mprsyncup gained the ability to specify a cxx_stdlib back when we thought
 we were going to support multiple cxx_stdlibs on a single OS version.
 Since we're not going to do that, there's no reason to even keep this
 feature in mprsyncup.

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Ticket URL: <https://trac.macports.org/ticket/59069#comment:5>
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