[libc-commits] [libc] [libc] Add `ctime_s` (PR #110676)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

Sorry all of the intricacies around __STDC_WANT_LIB_EXT1__. Annex K is somewhat taboo, and you're laying much of the groundwork here for supporting it.

https://github.com/llvm/llvm-project/pull/110676