[libcxx-commits] [libcxx] feat libcxx: avoid defining std::nullptr_t in terms of ::nullptr_t (PR #73442)

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philnik777 wrote:

If the include hierarchy is incorrect there will be a lot more problems, since we depend on our c headers being available in quite a few places. I expect this change to simply result in problems elsewhere, but not actually fix anything.

With C23 having adopted `nullptr` and `nullptr_t` LWG3484 seems irrelevant now.

https://github.com/llvm/llvm-project/pull/73442