png.h now includes pnglibconf.h update the include path so it can find it Change-Id: I594f1613e42405072029ae4cd7f9f8d0e03b2434
Change-Id: I0571813c1cfcf66abd36eb9f178fc49b618e88a6 Signed-off-by: Mike Lockwood <lockwood@google.com>