libmysqld/lib_sql.cc:
  This code seems to be superfluous
sql/derror.cc:
  in embedded server these functions should return the sign of the error
  instead of halting the program
sql/init.cc:
  my_abort_hook left unchanged
sql/mysql_priv.h:
  declaration of init_errmessage changed
  unireg_abort was replaced with DBUG_RETURN for embedded server
sql/mysqld.cc:
  these functions don't work in embedded server thus #ifdef-ed