[Mlir-commits] [mlir] [mlir][python] add `MLIR_BINDINGS_PYTHON_INSTALL_PREFIX` to make bindings install dir configurable (PR #124878)

[Maksim Levental]

makslevental wrote:

I'm changing this PR to be just the CMake updates - that way downstream users bring their own pyproject.toml (I've put the example [here](https://gist.github.com/makslevental/4dd1bb6c7c3ceb1c02a6a9836a9287b1)).

https://github.com/llvm/llvm-project/pull/124878