New review comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/38412#discussion_r946108067

Comment:
mostly, clean only cleans directories in /builddir and /destdir/. If one of the previous builds touched the system outside of these directories (and you were not using -t), it would still be broken. `zap` and `binary-bootstrap` recreate the masterdir from scratch, so that definitely gives you a clean state. `clean` should be good enough for all packages.