remove pre-made Makefile
remove pre-made Makefile

pornel/imgmin,jibsen/imgmin,pornel/imgmin,rflynn/imgmin,jibsen/imgmin,micmro/imgmin,rflynn/imgmin,micmro/imgmin,pornel/imgmin,rflynn/imgmin,rflynn/imgmin,micmro/imgmin,pornel/imgmin,jibsen/imgmin,micmro/imgmin,jibsen/imgmin