Add virtual dtor to QSGVideoNodeFactoryInterface

Makes it compile for me

Change-Id: Ib79f4c38bb165d3698a94c5d1aafee710423a907
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

src/multimedia/qtmultimediaquicktools_headers/qsgvideonode_p.h

@@ -81,6 +81,8 @@ Q_DECLARE_OPERATORS_FOR_FLAGS(QSGVideoNode::FrameFlags)
 class Q_MULTIMEDIAQUICK_EXPORT QSGVideoNodeFactoryInterface
 {
 public:
+    virtual ~QSGVideoNodeFactoryInterface();
+
     virtual QList<QVideoFrame::PixelFormat> supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const = 0;
     virtual QSGVideoNode *createNode(const QVideoSurfaceFormat &format) = 0;
 };

src/qtmultimediaquicktools/qsgvideonode_p.cpp

@@ -118,4 +118,8 @@ void QSGVideoNode::setTexturedRectGeometry(const QRectF &rect, const QRectF &tex
     markDirty(DirtyGeometry);
 }
 
+QSGVideoNodeFactoryInterface::~QSGVideoNodeFactoryInterface()
+{
+}
+
 QT_END_NAMESPACE