[MacPorts] #46521: Remove ports: xnu-headers, libc-headers, libm-headers, and CarbonHeaders

[MacPorts]

#46521: Remove ports: xnu-headers, libc-headers, libm-headers, and CarbonHeaders
----------------------------+------------------------
  Reporter:  summers@…      |      Owner:  jeremyhu@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.3.3
Resolution:                 |   Keywords:
      Port:  CarbonHeaders  |
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Comment (by jeremyhu@…):

 Nobody commented.  I said a week, but here it is after 4 days: r131699

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Ticket URL: <https://trac.macports.org/ticket/46521#comment:8>
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