[MacPorts] #53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++

[MacPorts]

#53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++
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  Reporter:  MarcusCalhoun-Lopez  |      Owner:  jeremyhu@…
      Type:  enhancement          |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-3.9            |
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Comment (by jeremyhu):

 Note that if that's non-trivial, we could do it your way (with a variant),
 but let's have it add the dependency on libgcc.

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Ticket URL: <https://trac.macports.org/ticket/53194#comment:3>
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