Fix non-windows developer build

Build was complaining about unused function

src/private/DragController.cpp

@@ -786,7 +786,6 @@ static QWidgetOrQuick *qtTopLevelForHWND(HWND hwnd)
     qCDebug(toplevels) << Q_FUNC_INFO << "Couldn't find hwnd for top-level" << hwnd;
     return nullptr;
 }
-#endif
 
 static QRect topLevelGeometry(const QWidgetOrQuick* topLevel)
 {
@@ -796,6 +795,8 @@ static QRect topLevelGeometry(const QWidgetOrQuick* topLevel)
     return topLevel->geometry();
 }
 
+#endif
+
 template <typename T>
 static WidgetType* qtTopLevelUnderCursor_impl(QPoint globalPos, const QVector<QWindow*> &windows, T windowBeingDragged)
 {