When mysql_server_init() interrupts on some error (wrong errmsg file
for example) in the middle of it's execution, it doesn't call
execute_ddl_log_recovery() so LOCK_gdl mutex isn't init-ed.
In this case we shouldn't execute release_ddl_log during cleanup
as it uses that mutex inside.


BitKeeper/etc/ignore:
  Added libmysqld/scheduler.cc libmysqld/sql_connect.cc libmysqld/sql_tablespace.cc libmysql_r/client_settings.h to the ignore list
libmysqld/lib_sql.cc:
  Bug #31868 mysql_server_init crash when language path is not correctly set.
  
  line moved to clean_up()
sql/mysqld.cc:
  Bug #31868 mysql_server_init crash when language path is not correctly set.
  
  release_ddl_log() now can be called from common 'clean_up()'
sql/sql_table.cc:
  Bug #31868 mysql_server_init crash when language path is not correctly set.
  
  do_release flag added to the global_ddl_log and the construcntor to
  set it's initial value.
  Also now release_ddl_log() checks for that flag.