session client UPDATE allow manual context fill

... for new sessions.
diff --git a/src/session_p.h b/src/session_p.h
index 0e1701b..c5c54e8 100644
--- a/src/session_p.h
+++ b/src/session_p.h
@@ -145,6 +145,7 @@
 /* ACCESS unlocked */
 struct nc_client_opts {
     char *schema_searchpath;
+    int auto_context_fill_disabled;
     ly_module_imp_clb schema_clb;
     void *schema_clb_data;
     struct nc_keepalives ka;