New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/31665#discussion_r659214704

Comment:
It should be possible to download tarballs for all submodules or ask them to publish useful tarballs. Cloning a branch name is susceptible to force pushes and you should use commit hashes instead.

If there are too many submodules, reconsider if this is really packageable.