GraphicsMagick: fixed integer overflows

GraphicsMagick was updated to fix integer overflows in the _png_malloc
functions (CVE-2012-3438).

Fixed bugs
bnc#773612
VUL-1: CVE-2012-3437,CVE-2012-3438: ImageMagick/GraphicsMagick: *_png_malloc overflow
Selected Binaries
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