fixed build with glib-2.0 before 2.38

g_assert_true() was added in 2.38

Author: jan.kneschke@oracle.com

tests/unit/t_network_mysqld_packet.c

@@ -501,7 +501,7 @@ test_mysqld_check_password(void) {
 
 g_assert_cmpint(0, ==, network_mysqld_proto_password_hash(hashed_password, S(hashed_password)));
 
-g_assert_true(network_mysqld_proto_password_check(S(challenge), S(auth_plugin_data), S(hashed_password)));
+g_assert_cmpint(TRUE, ==, network_mysqld_proto_password_check(S(challenge), S(auth_plugin_data), S(hashed_password)));
 
 g_string_free(challenge, TRUE);
 g_string_free(hashed_password, TRUE);