New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/38823#issuecomment-1222266745

Comment:
Can you mention in the commit message that this allows us to remove the definition from other templates, and that it avoids having to catch every time something needs PREFIX defined there? That history won't always be obvious.

I would already go with an additional `srcpkgs/:` commit  removing it from templates as well.