Use boost:bind() as the docs show. Allows compilation with older gcc versions.

src/torrentcreator/torrentcreatorthread.cpp

@@ -111,7 +111,7 @@ void TorrentCreatorThread::run() {
     if (abort) return;
     // calculate the hash for all pieces
     const QString parent_path = fsutils::branchPath(input_path) + "/";
-    set_piece_hashes(t, fsutils::toNativePath(parent_path).toUtf8().constData(), boost::bind<void>(&sendProgressUpdateSignal, _1, t.num_pieces(), this));
+    set_piece_hashes(t, fsutils::toNativePath(parent_path).toUtf8().constData(), boost::bind(sendProgressUpdateSignal, _1, t.num_pieces(), this));
     // Set qBittorrent as creator and add user comment to
     // torrent_info structure
     t.set_creator(creator_str.toUtf8().constData());