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

https://github.com/Johnnynator/void-packages neovim
https://github.com/void-linux/void-packages/pull/41728

neovim: add buildoption to build with lua5.1
- libluv: add buildoption to build with lua5.1
- neovim: add buildoption to build with lua5.1

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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/41728.patch is attached