songloader: Make sure timeout timer is started from correct thread

src/core/songloader.h

@@ -92,6 +92,7 @@ class SongLoader : public QObject {
   void LoadRemoteFinished();
 
  private slots:
+  void ScheduleTimeout();
   void Timeout();
   void StopTypefind();
 #if defined(HAVE_AUDIOCD) && defined(HAVE_GSTREAMER)
@@ -127,6 +128,8 @@ class SongLoader : public QObject {
   bool IsPipelinePlaying();
 #endif
 
+  void ScheduleTimeoutAsync();
+
  private:
   static QSet<QString> sRawUriSchemes;