There is an updated pull request by ii8 against master on the void-packages repository

https://github.com/ii8/void-packages mlton
https://github.com/void-linux/void-packages/pull/46951

New package: mlton-20210117

- I tested the changes in this PR: **YES**

#### New package
- This new package conforms to the [package requirements](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#package-requirements): **YES**

#### Local build testing
- I built this PR locally for my native architecture, x86_64-musl


A patch file from https://github.com/void-linux/void-packages/pull/46951.patch is attached