Please help review C23 features

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From: Dag-Erling_Smørgrav <des_at_FreeBSD.org>
Date: Tue, 05 Sep 2023 19:48:59 UTC

As you may have noticed, I've been working on adding C23 features to
libc.  I have a few more patches in flight which I'd like to get
committed in time for 14.0 but which still await review:

- Add a wchar version of the snprintf test for N2630 (formatted binary integers)
  https://reviews.freebsd.org/D41726

- Implement N2680 (specific-width length modifier)
  https://reviews.freebsd.org/D41725

- Add test cases for N2680 (and fix some nits in the N2630 tests)
  https://reviews.freebsd.org/D41743

- Implement N2867 (checked integer arithmetic)
  https://reviews.freebsd.org/D41734

- Add tests for N2867
  https://reviews.freebsd.org/D41735

This is far from everything we need for C23 (clang 16 understands N2630
but not N2680, for instance, and we're still missing <stdbit.h>) but it
gets us pretty close.

DES
--
Dag-Erling Smørgrav - des@FreeBSD.org