[package] GraphicsMagick 1.3.32 in alpine 3.10 is broken when processing PNGs
See bug:
https://sourceforge.net/p/graphicsmagick/bugs/610/
And associated fix:
https://sourceforge.net/p/graphicsmagick/code/ci/f30492f40f78d867b43422215057dd21de4ba447/
Currently the only way to fix this is to pull GM 1.3.33 from edge-community. Would be nice to see this backported to 3.10.
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