[MacPorts] #53784: Add support for tapi-tbd-v2

[MacPorts]

#53784: Add support for tapi-tbd-v2
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  Reporter:  jtalle       |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ld64-latest  |
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Comment (by jeremyhu):

 I started working on this a few weeks ago, but I didn't finish it.  If
 someone wants to pick up where I left off, see https://github.com/jeremyhu
 /macports-ports/commits/tapi-v2

 The trouble is that the tapi drop from Apple doesn't work with OSS llvm
 (at least not the versions I tried 3.7-devel at the time).  We will likely
 want to instead create a libtapi port which pulls in the version of llvm
 that Apple released from that same version of Xcode.

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Ticket URL: <https://trac.macports.org/ticket/53784#comment:4>
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