Re: [PR PATCH] [Closed]: common/build-style: add `dune` (OCaml builder)

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There's a closed pull request on the void-packages repository

common/build-style: add `dune` (OCaml builder)
https://github.com/void-linux/void-packages/pull/31601

Description:
<!-- Mark items with [x] where applicable -->

This PR defines a `dune.sh` build style to streamline OCaml builds using the [Dune](https://dune.build) builder.  Its purpose is analogous to the `cargo` build style for Rust projects, or `python3-module` build style for Python setup.py projects, etc.

As an example showing how it works, I've also added `ocaml-sexplib0` (a common sexp library for OCaml), which builds using `build_style=dune`.

#### General

- [x] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?

- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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