[Pkg-gmagick-im-team] Bug#823750: New bug

[Bastien ROUCARIES]

    Fix a wpg file out of bound

    Origin: upstream,
https://github.com/ImageMagick/ImageMagick/commit/bef1e4f637d8f665bc133a9c6d30df08d983bc3a
    bug: https://github.com/ImageMagick/ImageMagick/issues/120
    bug-ubuntu:
https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1542114
    bug-debian: https://bugs.debian.org/823750
    bug: https://github.com/ImageMagick/ImageMagick/issues/120