Exclude WinRT from build

Change-Id: I36de2011fa78c57e18f5e43b06e2f0ecca1b8f6c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

qtscript.pro

+requires(!winrt)
+
 load(qt_parts)