[Pkg-gmagick-im-team] Bug#823750: xcf file out of bound

[Bastien ROUCARIES]

ommit 9e76522e95ba1c14b11bb6973f3cbf469277c7c6
Author: Cristy <urban-warrior at imagemagick.org>
Date:   Sun May 8 21:50:10 2016 +0200

    Fix an out of bound in xcf file handling

    Bug: https://github.com/ImageMagick/ImageMagick/issues/104
    Bug: https://github.com/ImageMagick/ImageMagick/issues/103
    Bug-ubuntu:
https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1539052
    Bug-ubuntu:
https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1539051
    origin: upstream,
https://github.com/ImageMagick/ImageMagick/commit/ca0c886abd6d3ef335eb74150cd23b89ebd17135