[vala] Non-fast-forward update to branch wip/issue/1038

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/1038' 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:

  2880c2f... girwriter: Write c:symbol-prefix on supported elements
  37d1f5f... SQUASH Add c:symbol-prefix to <namespace>

Commits added to the branch:

  ef9c592... girwriter: Write c:symbol-prefix on supported elements (*)

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