[llvm] [LLVM] Silence compiler-rt warning in runtimes build (PR #99525)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

> How do `LLVM_CONFIG_PATH` and `LLVM_CMAKE_PATH` interact? If they don't then, we should be good.

Not sure myself, they seem to just point to different things and `compiler-rt` prefers the other one. I think it uses some CMake file operations to get the CMake path from the config path.

https://github.com/llvm/llvm-project/pull/99525