Support an "any" IKE version for both IKEv1 or IKEv2

src/stroke/stroke.c

@@ -138,7 +138,7 @@ static int add_connection(char *name,
 	msg.type = STR_ADD_CONN;
 
 	msg.add_conn.name = push_string(&msg, name);
-	msg.add_conn.ikev2 = 1;
+	msg.add_conn.version = 2;
 	msg.add_conn.auth_method = 2;
 	msg.add_conn.mode = 1;
 	msg.add_conn.mobike = 1;