[MacPorts] #42500: Move libunwind-headers back to ${prefix}/include

[MacPorts]

#42500: Move libunwind-headers back to ${prefix}/include
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  Reporter:  mfeiri@…                            |      Owner:  jeremyhu@…
      Type:  enhancement                         |     Status:  closed
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.2.1
Resolution:  fixed                               |   Keywords:
      Port:  libmacho-headers, dyld-headers,     |
  ld64, libcxxabi                                |
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Comment (by jeremyhu@…):

 Actually, do this now because of #46521.

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Ticket URL: <https://trac.macports.org/ticket/42500#comment:9>
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