package/gdk-pixbuf: security bump to version 2.36.12

package/gdk-pixbuf: security bump to version 2.36.12

- Fix CVE-2017-6312: Integer overflow in io-ico.c in gdk-pixbuf allows
  context-dependent attackers to cause a denial of service (segmentation
  fault and application crash) via a crafted image entry offset in an
  ICO file, which triggers an out-of-bounds read, related to compiler
  optimizations.
- Fix CVE-2017-6313: Integer underflow in the load_resources function in
  io-icns.c in gdk-pixbuf allows context-dependent attackers to cause a
  denial of service (out-of-bounds read and program crash) via a crafted
  image entry size in an ICO file.
- Fix CVE-2017-6314: The make_available_at_least function in io-tiff.c
  in gdk-pixbuf allows context-dependent attackers to cause a denial of
  service (infinite loop) via a large TIFF file.

Also update indentation in hash file (two spaces)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>