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

mdocml: backport patches for #9868
https://github.com/void-linux/void-packages/pull/23108

Description:
Fixes #9868 until a new upstream release.
Closes #13125.

It is important since some man pages are inaccessible without this.

For example: `man parallel` displays `moreutils_parallel.1` instead of `parallel.1`.

Also: `man vi` displays `nvi.1` instead of `vi.1` even when `vi` is the choosen alternative (this is less important since `man vim` works)

I took the patches verbatim from #9868, except I had to remove a hunk from the first patch for the file `TODO`.