make it easy to remove some print stuff
make it easy to remove some print stuff

leiyangyou/libvips,lovell/libvips,mcanthony/libvips,leiyangyou/libvips,leiyangyou/libvips,wishabi/libvips,jcupitt/libvips,mcanthony/libvips,jcupitt/libvips,mcanthony/libvips,jcupitt/libvips,wishabi/libvips,jcupitt/libvips,wishabi/libvips,lovell/libvips,leiyangyou/libvips,mcanthony/libvips,lovell/libvips,wishabi/libvips,lovell/libvips