Initial access log support.

src/nxt_conf_validation.c

@@ -75,6 +75,11 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_root_members[] = {
       &nxt_conf_vldt_object_iterator,
       (void *) &nxt_conf_vldt_app },
 
+    { nxt_string("access_log"),
+      NXT_CONF_VLDT_STRING,
+      NULL,
+      NULL },
+
     NXT_CONF_VLDT_END
 };