[MacPorts] #63707: clang-13: fix for SnowLeopard

[MacPorts]

#63707: clang-13: fix for SnowLeopard
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Changes (by kencu):

 * Attachment "0017-10.6-and-less-libcxxabi-work-around-no-
 reexported_symbo.patch" added.


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Ticket URL: <https://trac.macports.org/ticket/63707>
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