[clang-tools-extra] [clang-tidy] Do not warn on const variables in misc-use-internal-linkage (PR #97969)

[Piotr Zegar via cfe-commits]

PiotrZSL wrote:

When check were created with C++ in mind, it could work also for C. Would be good to support both, or mention in documentation that check is limited to C++, and maybe if there will be requests in future, it could be expanded to C.

https://github.com/llvm/llvm-project/pull/97969