varnishevent: add a necessary dependency on the -DBESTATS

bin/varnishevent/varnishevent.c

@@ -170,11 +170,12 @@ static inline logline_t
             AZ(rdr_free);
             signal_spscq_ready();
             LOG_Log0(LOG_DEBUG, "Reader: waiting for free list");
-            AZ(pthread_mutex_lock(&data_ready_lock));
             waiting = 1;
-            waits++;
-            if (!WRT_Waiting())
+            AZ(pthread_mutex_lock(&data_ready_lock));
+            if (!WRT_Waiting()) {
+                waits++;
                 AZ(pthread_cond_wait(&data_ready_cond, &data_ready_lock));
+            }
             waiting = 0;
             AZ(pthread_mutex_unlock(&data_ready_lock));
             rdr_free = DATA_Take_Freelist(&reader_freelist);
@@ -285,8 +286,10 @@ collect(struct logline_t *lp, enum VSL_tag_e tag, unsigned spec,
     case SLT_TxRequest:
     case SLT_TxURL:
     case SLT_RxStatus:
+#ifdef BESTATS
     case SLT_BackendReq:
     case SLT_Fetch_Hdr:
+#endif
     case SLT_Fetch_Body:
         if (!lp->spec)
             lp->spec = VSL_S_BACKEND;