New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/30122#discussion_r611121398

Comment:
Presence of pip and -devel make me think it's installing a bunch of packages from pypi. I wonder how we could make sure it isn't, assuming they are actually necessary for tests...

If the tests do rely on `pip`, I'm not sure we should be running them.