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

[MacPorts]

#62677: Add C++20 support for configure.cxx_standard
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 Reporter:  ryandesign   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 See the py-cipheycore port.

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