Code review comment for ~xnox/germinate/+git/builtusing2:master

Thank you for this review and comments.

Thinking about this now, I think the most user-friendly result here would be to do the following:

 - inspect built-using
 - if built-using binaries, are in build-deps
 - turn follow-build-depends back on for that build-dep

Plus, all the things you mentioned in your review comments including go and non-go test cases.