[clang] [clang] Rename files that MacOS libtool warns about (NFC) (PR #150054)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

> Should we just use ar/ranlib instead of libtool on Apple platform? I'm not sure how much performance difference there is between ar and libtool.

I'm pretty sure if you use an entirely llvm based tool chain that is what is happening and you won't see this error. The problem I and other users are reporting is when you want to build llvm now with the AppleClang toolchain. That being the case I don't think the right change os to swap out libtool, but instead to fix the cmake files.

https://github.com/llvm/llvm-project/pull/150054