Comment 3 for bug 1252719

Same issues reproduced when using imagemagick-6.8.7 (last IM version) instead of imagemagick-6.8.2 (devlibs-gtk3 version).

I've notice some type errors in the raster extensions (we use an "int" where IM expects a double, or a float instead of a size_t...), but I'm not sure it's directly related to our crashes.