remove suffix from tiles
remove suffix from tiles

see https://github.com/jcupitt/libvips/issues/129

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