This normally works because the only module linking to tiff (windowscodecs) also
pulls in static zlib via PNG_PE_LIBS. However, if using shared libpng,
windowscodecs will currently fail to link.
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>