[libcxx-commits] [libcxx] [libc++] Simplify the implementation of <stddef.h> (PR #86843)

[Louis Dionne via libcxx-commits]

ldionne wrote:

@BertalanD I haven't finished digging into this, but this looks like a Clang-builtins-header bug to me. I don't understand why the clang builtin headers would be overriding `NULL` again, let alone with `0` when we're in C++ mode. Do you agree?

https://github.com/llvm/llvm-project/pull/86843