[llvm] [CMake][OCaml] Make OCaml bindings suitable for out-of-tree install (PR #123478)

[via llvm-commits]

alan-j-hu wrote:

I uncovered an issue when running OCaml bytecode executables, compiled using the LLVM static library. It's difficult for me to test this PR because of the way OCaml packages are handled. Therefore, I am currently not confident in my ability to ensure this PR is correct. I need to take a breather and figure out a good way to test the OCaml package installation (perhaps via CI), before continuing to work on this.

https://github.com/llvm/llvm-project/pull/123478