Qt: fix build with --disable-media-library

Sorry for the problem.

modules/gui/qt4/components/playlist/playlist.cpp

@@ -94,8 +94,12 @@ PlaylistWidget::PlaylistWidget( intf_thread_t *_p_i, QWidget *_par )
     setMinimumWidth( 400 );
 
     PLModel *model = new PLModel( p_playlist, p_intf, p_root, this );
+#ifdef MEDIA_LIBRARY
     MLModel *mlmodel = new MLModel( p_intf, this );
     mainView = new StandardPLPanel( this, p_intf, p_root, selector, model, mlmodel );
+#else
+    mainView = new StandardPLPanel( this, p_intf, p_root, selector, model, NULL );
+#endif
 
     /* Location Bar */
     locationBar = new LocationBar( model );

modules/gui/qt4/components/playlist/standardpanel.cpp

@@ -195,12 +195,14 @@ void StandardPLPanel::searchDelayed( const QString& searchText )
 /* This activated by the selector selection */
 void StandardPLPanel::setRoot( playlist_item_t *p_item, bool b )
 {
+#ifdef MEDIA_LIBRARY
     if( b )
     {
         msg_Dbg( p_intf, "Setting the SQL ML" );
         currentView->setModel( mlmodel );
     }
     else
+#endif
     {
         msg_Dbg( p_intf, "Normal PL/ML or SD" );
         if( currentView->model() != model )
@@ -354,6 +356,7 @@ void StandardPLPanel::createTreeView()
 
 void StandardPLPanel::changeModel( bool b_ml )
 {
+#ifdef MEDIA_LIBRARY
     VLCModel *mod;
     if( b_ml )
         mod = mlmodel;
@@ -361,6 +364,7 @@ void StandardPLPanel::changeModel( bool b_ml )
         mod = model;
     if( currentView->model() != mod )
         currentView->setModel( mod );
+#endif
 }
 
 void StandardPLPanel::showView( int i_view )

modules/gui/qt4/components/simple_preferences.cpp

@@ -549,7 +549,9 @@ SPrefsPanel::SPrefsPanel( intf_thread_t *_p_intf, QWidget *_parent,
             ui.assoButton->hide();
             ui.assocLabel->hide();
 #endif
+#ifdef MEDIA_LIBRARY
             BUTTONACT( ui.sqlMLbtn, configML() );
+#endif
 
             /* interface */
             char *psz_intf = config_GetPsz( p_intf, "intf" );
@@ -891,9 +893,11 @@ void SPrefsPanel::changeStyle( QString s_style )
 
 void SPrefsPanel::configML()
 {
+#ifdef MEDIA_LIBRARY
     MLConfDialog *mld = new MLConfDialog( this, p_intf );
     mld->exec();
     delete mld;
+#endif
 }
 
 #ifdef WIN32