queue/Listener: add noexcept

src/queue/Listener.hxx

@@ -25,19 +25,19 @@ public:
 	/**
 	 * Called after the queue has been modified.
 	 */
-	virtual void OnQueueModified() = 0;
+	virtual void OnQueueModified() noexcept = 0;
 
 	/**
 	 * Called after a playback options have been changed.
 	 */
-	virtual void OnQueueOptionsChanged() = 0;
+	virtual void OnQueueOptionsChanged() noexcept = 0;
 
 	/**
 	 * Called after the player has started playing a new song.
 	 * This gets called by playlist::SyncWithPlayer() after it has
 	 * been notified by the player thread.
 	 */
-	virtual void OnQueueSongStarted() = 0;
+	virtual void OnQueueSongStarted() noexcept = 0;
 };
 
 #endif