[MacPorts] #62677: Add C++20 support for configure.cxx_standard

[MacPorts]

#62677: Add C++20 support for configure.cxx_standard
--------------------------+----------------------------
  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:  MacPorts 2.9.0
 Component:  base         |    Version:
Resolution:  fixed        |   Keywords:
      Port:               |
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Changes (by jmroot):

 * milestone:   => MacPorts 2.9.0


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Ticket URL: <https://trac.macports.org/ticket/62677#comment:14>
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