[llvm] [mlir] Fix CMake dependencies on mlir-linalg-ods-yaml-gen (PR #111973)

[Thomas Preud'homme via llvm-commits]

RoboTux wrote:

I'm guessing it does not. I could change the variable to not be a cache variable. @mstorsjo Is there a reason why get_host_tool_path() sets the executable and target variables as cache? It seems to me to be build system internals.

https://github.com/llvm/llvm-project/pull/111973