Updating mksprite to support libpng 1.6
Updating mksprite to support libpng 1.6
sp1187/libdragon,conker64/libdragon,sp1187/libdragon,kmather73/libdragon,kmather73/libdragon,DragonMinded/libdragon,conker64/libdragon,DragonMinded/libdragon,DragonMinded/libdragon,sp1187/libdragon