Added the patch from the tracker for support with newer PNG 1.5 lib.
http://sourceforge.net/tracker/?func=detail&aid=3177485&group_id=5776&atid=105776
I needed to change the patch a little so it did work again. The Item was posted by:thomasklausner
Authored by: waldviertler 2011-02-12
Parent: [r3290]
Child: [r3292]