[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:  2.8.1
Resolution:                    |   Keywords:
      Port:  gcc13, gcc-devel  |
-------------------------------+--------------------

Comment (by lepus2589):

 This is an issue in the GCC stdlibc++ headers and has been fixed upstream:
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113241

 Should be fixed with GCC v13.3

 Can we update the {{{gcc-devel}}} port to a fixed snapshot in the
 meantime? The earliest fixed snapshot should be {{{14-20240107}}}. It is
 at {{{14-20231001}}}, ATM.

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Ticket URL: <https://trac.macports.org/ticket/68592#comment:4>
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