Use lambdas for QtConcurrent::run instead of NewClosure

src/playlist/songloaderinserter.cpp

@@ -20,7 +20,7 @@
 
 #include "config.h"
 
-#include <QtConcurrentRun>
+#include <QtConcurrent>
 #include <QtAlgorithms>
 #include <QList>
 #include <QUrl>
@@ -83,7 +83,7 @@ void SongLoaderInserter::Load(Playlist *destination, int row, bool play_now, boo
     deleteLater();
   }
   else {
-    QtConcurrent::run(this, &SongLoaderInserter::AsyncLoad);
+    (void)QtConcurrent::run([=]{ AsyncLoad(); });
   }
 }