[MacPorts] #68592: gcc13 does not work with Macports-installed libc++: error: expected identifier before '__is_convertible'

[MacPorts]

#68592: gcc13 does not work with Macports-installed libc++: error: expected
identifier before '__is_convertible'
-------------------------------+--------------------
  Reporter:  barracuda156      |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.9.1
Resolution:                    |   Keywords:
      Port:  gcc13, gcc-devel  |
-------------------------------+--------------------
Changes (by barracuda156):

 * version:  2.8.1 => 2.9.1


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Ticket URL: <https://trac.macports.org/ticket/68592#comment:6>
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