[libsoup/f21] (3 commits) ...Tighten deps with the _isa macro

[Kalev Lember]

Summary of changes:

  4bb6cf9... Update to 2.47.92 (*)
  b85d84b... Drop manual -devel deps (*)
  abb0bdd... Tighten deps with the _isa macro (*)

(*) This commit already existed in another branch; no separate mail sent