[clang] [clang][modules] giving the __stddef_ headers their own modules can cause redeclaration errors with -fbuiltin-headers-in-system-modules (PR #84127)

[Ian Anderson via cfe-commits]

ian-twilightcoder wrote:

We should consider this for LLVM 18, it's a regression from 
https://reviews.llvm.org/D159064
https://github.com/llvm/llvm-project/pull/84127
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