if we fall back to mysql_alter_table() (for InnoDB), don't do binlogging in mysql_alter_table(), as mysql_admin_table()
is not supposed to do any binlogging (it is done by the caller).


sql/sql_table.cc:
  When optimizing a table, if we fall back to mysql_alter_table()
  (for InnoDB), don't do binlogging in mysql_alter_table(), as mysql_admin_table()
  is not supposed to do any binlogging (it is done by the caller).