bug #16892 (mysql_client_test fails in embedded server)

mysql-test/t/mysql_client_test.test:
  test disabled in embedded server

mysql-test/t/mysql_client_test.test

+# This test should work in embedded server after we fix mysqltest
+-- source include/not_embedded.inc
+
 # We run with different binaries for normal and --embedded-server
 #
 # If this test fails with "command "$MYSQL_CLIENT_TEST" failed",