[vala] Non-fast-forward update to branch wip/issue/894

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/894' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  e1d0357... vala: Automatically remove superfluous silent casts
  f02d8a4... vapigen: Avoid superfluous cast

Commits added to the branch:

  e7d7984... vapigen: Avoid superfluous cast (*)

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