Code review comment for ~tsimonq2/germinate:master

On the one hand this makes sense for the bug at hand, but this fails to take into consideration the wider effect of how libraries migrate. We have britney set to SMOOTH_UPDATES = libs oldlibs such that e.g. a new libefivar2 can migrate while packages still Depend on libefivar1, as long as they are co-installable.

The proposed change here would break image building in that case which does not seem the right cause of action.