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Clang: C++20 flag for Clang 11.0+, record full C++17 support for Clang 6.0+

Raul Tambre requested to merge tambre/cmake:clang_cxx20 into master
  • -std=c++20 supersedes -std=c++2a in Clang 11.0 (commit). Use that for Clang 11.0+.
  • Clang 6.0+ fully support C++17 language features per the cppreference.com C++17 compiler support table.

Backport: release

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