[MacPorts] #56567: python portgroup should use -stdlib

[MacPorts]

#56567: python portgroup should use -stdlib
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 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:
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 The python portgroup does not pass the `-stdlib=...` flag in `CXXFLAGS`.
 This causes C++11-using Python ports like py-re2 (after
 [https://github.com/macports/macports-ports/pull/1905 PR 1905] which
 updates it to 1.0.6 is merged) to fail to build on OS X < 10.9 with
 libstdc++.

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Ticket URL: <https://trac.macports.org/ticket/56567>
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