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C17 and C23 support

Raul Tambre requested to merge tambre/cmake:c_17_23 into master

This includes quite a few things C related things I noticed needed improving/fixing while working on #21771 (closed).

  • C17, C23 support.
  • C17, C23 for GCC and Clang.
  • Fix default standard detection for Clang in MSVC compatibility mode.
  • Select Clang standard flags based on the frontend variant not the ABI mode.

Fixes: #17755 (closed)

Edited by Brad King

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