gdk-pixbuf: fix CVE-2020-29385

Backport patch from
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/bdd3acbd48a575d418ba6bf1b32d7bda2fae1c81



image file in upstream patch is for test purpose only, it cause error during
do_patch so drop it:
File tests/test-images/fail/hang_114.gif: git binary diffs are not supported.

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 7cd401b7)
Signed-off-by: Steve Sakoman <steve@sakoman.com>