[vala] (5 commits) Non-fast-forward update to branch wip/issue/996

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/996' 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:

  b6a85de... girwriter: Evaluate and output non literal enum-value if it

Commits added to the branch:

  b76e60c... vapi: Update GIR-based bindings (*)
  a3e7970... Sync NEWS from 0.48 (*)
  481ca63... gtk+-3.0: Deprecated abstract methods are not required to b (*)
  f844ad1... glib-2.0: Map given end == 0 for string.slice/splice() to s (*)
  086cd34... girwriter: Evaluate and output non literal enum-value if it

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