Qt: add a bunch of virtual for destructors

modules/gui/qt4/adapters/variables.hpp

@@ -40,7 +40,7 @@ private:
 
 public:
     QVLCVariable (vlc_object_t *, const char *, int, bool);
-    ~QVLCVariable (void);
+    virtual ~QVLCVariable (void);
 };
 
 class QVLCPointer : public QVLCVariable

modules/gui/qt4/components/epg/EPGView.hpp

@@ -53,7 +53,7 @@ Q_OBJECT
 
 public:
     explicit EPGView( QWidget *parent = 0 );
-    ~EPGView();
+    virtual ~EPGView();
 
     void            setScale( double scaleFactor );
 

modules/gui/qt4/components/playlist/playlist_model.hpp

@@ -172,7 +172,7 @@ class PlMimeData : public QMimeData
 
 public:
     PlMimeData() {}
-    ~PlMimeData();
+    virtual ~PlMimeData();
     void appendItem( input_item_t *p_item );
     QList<input_item_t*> inputItems() const;
     QStringList formats () const;

modules/gui/qt4/dialogs/external.hpp

@@ -40,7 +40,7 @@ class DialogHandler : public QObject
 
 public:
     DialogHandler (intf_thread_t *, QObject *parent);
-    ~DialogHandler (void);
+    virtual ~DialogHandler (void);
 
 private:
     intf_thread_t *intf;

modules/gui/qt4/dialogs/fingerprintdialog.hpp

@@ -43,7 +43,7 @@ class FingerprintDialog : public QDialog
 public:
     FingerprintDialog( QWidget *parent, intf_thread_t *p_intf,
                                 input_item_t *p_item );
-    ~FingerprintDialog();
+    virtual ~FingerprintDialog();
 
 private:
     Ui::FingerprintDialog *ui;

modules/gui/qt4/managers/addons_manager.hpp

@@ -47,7 +47,7 @@ public:
     {
         addon_entry_Hold( p_entry );
     }
-    ~AddonManagerEvent()
+    virtual ~AddonManagerEvent()
     {
         addon_entry_Release( p_entry );
     }
@@ -65,7 +65,7 @@ class AddonsManager : public QObject, public Singleton<AddonsManager>
 
 public:
     AddonsManager( intf_thread_t * );
-    ~AddonsManager();
+    virtual ~AddonsManager();
     static void addonsEventsCallback( const vlc_event_t *, void * );
     void customEvent( QEvent * );
     void install( QByteArray id );

modules/gui/qt4/util/input_slider.hpp

@@ -56,7 +56,7 @@ class SeekSlider : public QSlider
     Q_PROPERTY(qreal handleOpacity READ handleOpacity WRITE setHandleOpacity)
 public:
     SeekSlider( Qt::Orientation q, QWidget *_parent = 0, bool _classic = false );
-    ~SeekSlider();
+    virtual ~SeekSlider();
     void setChapters( SeekPoints * );
 
 protected: