Fixed Build Behavior on Mac OSX Snow Leopard #8
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On OSX libpng is installed in a non standard directory
(/usr/X11). The png package included in cmake takes care
of this.
Additionally fltk currently has to be built as 386 on
Snow Leopard, this then requires stage to be built as
386 as well.
This commit addopts the CMakeLists file to ensure the
correct behavior with OSX Snow Leopard.