libsaria: Add a debugging message

Helpful for knowing what path the audio subsystem is attempting to load.

libsaria/audio/controls.cpp

@@ -1,6 +1,7 @@
 
 #include <libsaria/audio.h>
 #include <libsaria/callback.h>
+#include <libsaria/print.h>
 #include "audio.h"
 
 static string cur_file;
@@ -53,6 +54,7 @@ namespace libsaria
 	{
 		string uri = "file://" + file;
 		reset();
+		println("Loading uri: " + uri);
 		cur_file = file;
 		g_object_set(G_OBJECT(get_player()), "uri", uri.c_str(), NULL);
 		trigger_callback(TRACK_LOADED);