[llvm-branch-commits] [libcxx] release/18.x: [libc++] Fix -Wgnu-include-next in stddef.h (#88214) (PR #88419)

[Ian Anderson via llvm-branch-commits]

ian-twilightcoder wrote:

We should take this in LLVM 18 because it's a regression from https://github.com/llvm/llvm-project/pull/87374

https://github.com/llvm/llvm-project/pull/88419