[clutter/msvc-support] (13 commits) ...Merge branch 'master' into msvc-support

[Chun-wei Fan <fanchunwei src gnome org>]

Summary of changes:

  a9690a4... a11y: Using AtkWindow on cally-stage (*)
  7635cb6... a11y: We don't need to explicitly manage window events (*)
  663bfd0... a11y: Using proper way to register to window events (*)
  96810e1... build: Add -lm to clutter's LIBADD rule (*)
  3314385... box: Munge the allocation passed to the layout manager (*)
  368c916... layout-managers: Take into account the allocations's origin (*)
  c26dd3f... Release Clutter 1.7.12 (snapshot) (*)
  2212937... Post-release version bump to 1.7.13 (*)
  f1a7cd7... Merge branch 'atkwindow' (*)
  d847d43... actions/drag: Be more reliable when destroying the drag han (*)
  0aacbd4... actor: make offscreen_redirect prop take flags + default of (*)
  b428c39... Updated Spanish translation (*)
  14e96ce... Merge branch 'master' into msvc-support

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