[clang-tools-extra] [clang-tidy] new check misc-use-internal-linkage (PR #90830)

[Julian Schmidt via cfe-commits]

https://github.com/5chmidti commented:

Regarding unit build:
`google-global-names-in-headers` is one of the checks that check file extensions: https://github.com/llvm/llvm-project/blob/d33937b6236767137a1ec3393d0933f10eed4ffe/clang-tools-extra/clang-tidy/google/GlobalNamesInHeadersCheck.cpp#L42-L44

Nice that there is a check for this now, it looks like there are a few instances of this issue in LLVM as well.

https://github.com/llvm/llvm-project/pull/90830