Fix calculation of 'Average time in queue' stat under libtorrent 1.1.x

src/base/bittorrent/session.h

@@ -188,6 +188,9 @@ namespace BitTorrent
             int diskBlocksInUse = 0;
             int numBlocksRead = 0;
             int numBlocksCacheHits = 0;
+            int writeJobs = 0;
+            int readJobs = 0;
+            int hashJobs = 0;
             int queuedDiskJobs = 0;
             int diskJobTime = 0;
         } disk;