[MacPorts] #55441: libcxx, libcxxabi: also install into the SDKs

[MacPorts]

#55441: libcxx, libcxxabi: also install into the SDKs
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  Reporter:  ryandesign         |      Owner:  jeremyhu
      Type:  enhancement        |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:  snowleopard haspatch
      Port:  libcxx, libcxxabi  |
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Comment (by kencu):

 I did get clang-3.8 PPC to build on Tiger, using gcc6 and libgcc to
 accomplish that.

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Ticket URL: <https://trac.macports.org/ticket/55441#comment:4>
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