New review comment by CameronNemo on void-packages repository

https://github.com/void-linux/void-packages/pull/26000#discussion_r559048276

Comment:
@agausmann the behavior you described for building subpackages is expected. You build a source package, and all of its subpackages get built. If there are issues with how mkplatformfs handles things, then we can iron it out in the PR over there.