QAnimationDriver: mark obsolete functions as deprecated

Mark the two long obsolete (and empty) functions as deprecated so they
can be removed with Qt6:
 - setStartTime()/startTime()

Change-Id: I7ee1d99ff194860e41723909f81adc181a71ec7c
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

src/corelib/animation/qabstractanimation.cpp

@@ -773,6 +773,7 @@ QAnimationDriver::~QAnimationDriver()
 }
 
 
+#if QT_DEPRECATED_SINCE(5, 13)
 /*!
     Sets the time at which an animation driver should start at.
 
@@ -799,6 +800,7 @@ qint64 QAnimationDriver::startTime() const
 {
     return 0;
 }
+#endif
 
 
 /*!

src/corelib/animation/qabstractanimation.h

@@ -147,9 +147,10 @@ public:
 
     virtual qint64 elapsed() const;
 
-    // ### Qt6: Remove these two functions
-    void setStartTime(qint64 startTime);
-    qint64 startTime() const;
+#if QT_DEPRECATED_SINCE(5, 13)
+    QT_DEPRECATED void setStartTime(qint64 startTime);
+    QT_DEPRECATED qint64 startTime() const;
+#endif
 
 Q_SIGNALS:
     void started();