FFE: germinate follow-build-depends-all feature

[Colin Watson]

I'd like to sync germinate 2.33 from unstable:

germinate (2.33) unstable; urgency=medium

  [ Colin Watson ]
  * Document (no-)follow-build-depends in germinate(1).
  * Move Build-Depends-Indep to Build-Depends; some of these are needed
    during the clean target (e.g. python3-setuptools), and since germinate
    builds no architecture-dependent packages it isn't worth maintaining
    these lists separately.

  [ Steve Langasek ]
  * Add a new follow-build-depends-all feature.

 -- Colin Watson <email address hidden> Sun, 22 Mar 2020 21:51:51 +0000

Steve added the follow-build-depends-all feature back in November, and it's already been deployed to production and is used by the i386 seeds. I think it'd make sense for the packaged version of germinate in focal to be able to handle this.

[Steve Langasek (vorlon)]

Missed for focal unfortunately, but we have this version in groovy.

If this is wanted as an SRU in focal, we could revisit that.