(Fixing of problem with ALTER TABLE on BDB tables)


mysql-test/r/distinct.result:
  Fixed results after bug fix
sql/mysql_priv.h:
  Split close_thread_tables() into two functions.
  (Needed for bug fix from 4.0)
sql/sql_base.cc:
  Split close_thread_tables() into two functions.
  (Needed for bug fix from 4.0)