[libc-commits] [libc] [libc] Add LIBC_NAMESPACE_DECL macro (PR #97109)

[Roland McGrath via libc-commits]

https://github.com/frobtech approved this pull request.

`git grep LIBC_NAMESPACE -- 'libc*.rst'` shows other example snippets that are violating the new style requirement, so those should be updated too.  Many are in libc/docs/dev/clang_tidy_checks.rst, so for there let's just add a big TODO comment pointing to an issue we file to track morphing the clang-tidy check/fixit into enforcing the new style.  We can fix that up when we land the changes to the clang-tidy check's implementation. But the other places in libc/docs should be updated in this change.

https://github.com/llvm/llvm-project/pull/97109