[gdk-pixbuf/gnome-2-38] (16 commits) ...Update NEWS for 2.38.1

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  fb32a04... tests: Add comprehensive GIF test suite (*)
  06afde5... gif: Fix off by one error in LZW decoder (*)
  b9b12bf... gif: Fix multiple LZW clear codes breaking decoding (*)
  88ceed9... gif: Fix clear code handling when at end of a block (*)
  0b9d004... gif: Add "Circular table entry" failing GIF image test case (*)
  a314f59... gif: Simplify LZW clear code handling (*)
  fafd2b1... ci: install mingw gtk-doc (*)
  ca0106c... Update Kazakh translation (*)
  53dae76... Merge branch 'gif-fixes' into 'master' (*)
  7f6865b... Update Icelandic translation (*)
  6be34fd... Update Dutch translation (*)
  f7383d9... tests: Add test for a PNG crasher (*)
  2f71ebe... Merge branch 'wip/hadess/add-bug793470-test' into 'master' (*)
  60e8eae... io-jasper.c: Validate jas_matrix_create result (*)
  a3094cc... Update Korean translation (*)
  da9e6d0... Update NEWS for 2.38.1

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