Remove unneeded Windows CE dummy functions

With the change I69f4d5d504e2341555d9991c68e82beed2e8129c
IsZoomed function is no longer needed.

Change-Id: I07239f3e81509f8a966e64ee9705a04ea41cb38d
Reviewed-by: Björn Breitmeyer <bjoern.breitmeyer@kdab.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/platforms/windows/qplatformfunctions_wince.h

@@ -275,11 +275,6 @@ inline bool IsIconic( HWND /*hWnd*/ )
     return false;
 }
 
-inline bool IsZoomed( HWND /*hWnd*/ )
-{
-    return true;
-}
-
 inline int AddFontResourceExW( LPCWSTR /*name*/, DWORD /*fl*/, PVOID /*res*/)
 {
     return 0;