New review comment by heliocat on void-packages repository

https://github.com/void-linux/void-packages/pull/29304#discussion_r589268771

Comment:
This will error for most installs that didn't come from the live image. Something like `[ -f /usr/share/xbps.d/void-virtualpackages.conf ] && sed ...` would do it. 

EDIT: never mind, this is in the make_system_dirs hook which I believe only fires when first installed. Shouldn't code review when tired.