[MacPorts] #50448: Change filenames of binary packages built against libc++ on < 10.9

[MacPorts]

#50448: Change filenames of binary packages built against libc++ on < 10.9
--------------------------+--------------------------------
  Reporter:  mojca        |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  High         |  Milestone:
 Component:  base         |    Version:  2.4.0
Resolution:               |   Keywords:
      Port:               |
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Changes (by mojca):

 * priority:  Normal => High
 * version:  2.3.4 => 2.4.0


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Ticket URL: <https://trac.macports.org/ticket/50448#comment:9>
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