compile fix for no-opengl

8b83b4329df26c5729bf4b224f77fc83822ea1ca removed the ZW option, as it
was not required. However, the winrtpageflipper for non-opengl uses
exceptions and hence required it for CreateException.

Change-Id: I81b6283701c39baad750a26e6014effafefd8e69
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>