[libcxx-commits] [libcxx] [libc++] stddef.h needs to #include_next for the new clang __need_ macros (PR #86252)

[Louis Dionne via libcxx-commits]

ldionne wrote:

These macros are obscure. I would, in fact, much rather remove any knowledge of `__need_` macros from our headers.

https://github.com/llvm/llvm-project/pull/86252