New comment by subnut on void-packages repository

https://github.com/void-linux/void-packages/pull/37639#issuecomment-1162915676

Comment:
> all the `sed`s in pre_build should be `vsed`s and possibly be moved to `post_patch` (or turned into patches)

Okay, I've converted it into a patch.

Should I expand this PR to turn the remaining `sed`s into patches too?