[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 ryandesign):

 Replying to [ticket:55441 ryandesign]:
 > Xcode 3 on Snow Leopard also installs the 10.5 SDK. I'm not sure if the
 port should try to install to there as well if present.

 The patches I attached do this, but I guess if we do this we should really
 set `macosx_deployment_target 10.5`, huh? Would that still work ok on
 10.6? I haven't tested it.

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Ticket URL: <https://trac.macports.org/ticket/55441#comment:1>
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