slirp: remove unused field tt

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/slirp/slirp.h b/slirp/slirp.h
index dfc3e3a..fe0e65d 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -215,7 +215,6 @@
     char client_hostname[33];
 
     int restricted;
-    struct timeval tt;
     struct ex_list *exec_list;
 
     /* mbuf states */