don't init ddl_log on --help

fixes mtr failures when run from /usr/share/mysql-test

Author: vuvova

sql/mysqld.cc

@@ -5074,7 +5074,7 @@ static int init_server_components()
 
  tc_log= 0; // ha_initialize_handlerton() needs that
 
- if (ddl_log_initialize())
+ if (!opt_abort && ddl_log_initialize())
  unireg_abort(1);
 
  if (plugin_init(&remaining_argc, remaining_argv,