[MacPorts] #70048: nghttp2 now requires C++20 which introduces a dependency cycle with clang compilers

[MacPorts]

#70048: nghttp2 now requires C++20 which introduces a dependency cycle with clang
compilers
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  Reporter:  conradkun                           |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  High                                |  Milestone:
 Component:  ports                               |    Version:  2.9.3
Resolution:                                      |   Keywords:
      Port:  nghttp2 curl clang-5.0 clang-6.0    |
  clang-7.0 clang-8.0 clang-9.0 clang-10         |
  clang-11 clang-12 clang-13 clang-14 clang-15   |
  clang-16 clang-17 clang-18                     |
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Comment (by jmroot):

 BTW, this also means that nghttp2 can't be built on 10.6 at all, because
 the current compiler selection logic won't choose anything newer than
 clang-11 there.

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Ticket URL: <https://trac.macports.org/ticket/70048#comment:6>
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