Regression in backport of flickering-related bug fix

The fix for 6333613 backported to the 1.5.0_10 update release tree was applied incorrectly. The native method Java_sun_awt_windows_WCanvasPeer_disableNativeBackgroundErase was lost in the delta 1.82 of file src/windows/native/sun/windows/awt_Canvas.cpp. You can see that that delta is actually empty. This has broken JOGL with 5.0 update 10. See http://www.javagaming.org/forums/index.php?topic=15439.0 .