[clang-tools-extra] [clang-tidy] Avoid processing declarations in system headers (PR #128150)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

> I did try having a look at it but could not find a solution. 

Could you summarize what you tried and why it did not work? It is not just about fixing one check but potentially losing a capability. If we can no longer write certain kinds of checks in tidy that is a very big trade off. 

https://github.com/llvm/llvm-project/pull/128150