swars, move to libpng16, fix reference to libSDL (#4036)
swars, move to libpng16, fix reference to libSDL (#4036)

disable x86_64

nielx/haikuports,moochris/haikuports,haikuports/haikuports,Begasus/haikuports,Begasus/haikuports,Begasus/haikuports,haikuports/haikuports,nielx/haikuports,moochris/haikuports,moochris/haikuports,Begasus/haikuports,haikuports/haikuports,haikuports/haikuports,nielx/haikuports,Begasus/haikuports,haikuports/haikuports