[gegl] Created tag GEGL_0_4_12

[Øyvind "pippin" Kolås <ok src gnome org>]

The unsigned tag 'GEGL_0_4_12' was created.

Tagger: Øyvind Kolås <pippin gimp org>
Date: 1540297339 +0200

    0.4.12

Changes since the last tag 'GEGL_0_4_10':

Ell (3):
      buffer: apply gamma curve to alpha component during filtering
      tests: update mipmap reference images after last commit
      Partially revert "buffer: fix source rect passed to gegl_resample_{linear,boxfilter}()"

Rodrigo Lledó (1):
      Update Spanish translation

Øyvind Kolås (4):
      post-release version bump
      jp2-load: remove unnedd cast in g_clear_pointer
      NEWS: update
      release 0.4.12