[MacPorts] #52663: libcxxabi patch to update to 3.9.0

[MacPorts]

#52663: libcxxabi patch to update to 3.9.0
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  Reporter:  ken.cunningham.webuse@…  |      Owner:  jeremyhu@…
      Type:  submission               |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:  2.3.4
Resolution:                           |   Keywords:  haspatch
      Port:  libcxxabi                |
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Comment (by larryv@…):

 I think the LLVM project clearly has a preference for CMake at this point.
 We should probably switch to it for this port as we already have for the
 LLVM ports.

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Ticket URL: <https://trac.macports.org/ticket/52663#comment:3>
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