Update revisions on bottled libpng dependents
ghostscript: update 9.10 bottle.
gd: update 2.1.0 bottle.
s-lang: update 2.2.4 bottle.
imagemagick: update 6.8.7-7 bottle.
graphviz: update 2.36.0 bottle.
Update revisions on libpng dependents
imagemagick: update 6.8.7-7 bottle.