Add Missing Debug Operator Declaration for QTouchEvent::TouchPoint

Debug operator for QTouchEvent::TouchPoint was added in
fa81aa6
but that commit was missing the declaration.

Change-Id: I1bce5f131c5995e0696babe3172cbba95704ac5d
Reviewed-by: Friedemann Kleint <[email protected]>

Author: Kalle Viironen

src/gui/kernel/qevent.cpp

@@ -3206,6 +3206,8 @@ QShortcutEvent::~QShortcutEvent()
 
 #ifndef QT_NO_DEBUG_STREAM
 
+QDebug operator<<(QDebug, const QTouchEvent::TouchPoint &);
+
 static inline void formatTouchPoint(QDebug d, const QTouchEvent::TouchPoint &tp)
 {
     d << "TouchPoint(" << tp.id() << ' ' << tp.rect();