New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/28570#discussion_r571708432

Comment:
So it checks for the plymouth library at configure time (I could find this line), but doesn't link against it? At least I couldn't see anything about it in the CI log...

Just wondering what it is that it does with the library, and if we need any sort of warning about plymouth library revbump or such.