[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
-------------------------------------------------+-------------------------
  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                     |
-------------------------------------------------+-------------------------
Changes (by conradkun):

 * Attachment "cmake_bootstrap.log" added.

 /opt/local/var/macports/build/_opt_local_var_macports_sources_github
 .com_macports_macports-
 ports_devel_cmake/cmake/work/cmake-3.29.3-x86_64/Bootstrap.cmk/cmake_bootstrap.log

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