Fixed bug that causes select test to fail

Now MySQL 4.1 is up to date with all patches from 4.0.4 and passes the test suite.

mysql-test/r/rpl_log_pos.result

@@ -9,7 +9,7 @@ File	Position	Binlog_do_db	Binlog_ignore_db
 master-bin.001	79		
 show slave status;
 Master_Host	Master_User	Master_Port	Connect_retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_do_db	Replicate_ignore_db	Last_errno	Last_error	Skip_counter	Exec_master_log_pos	Relay_log_space
-127.0.0.1	root	MASTER_PORT	1	master-bin.001	79	slave-relay-bin.002	120	master-bin.001	Yes	Yes			0		0	79	128
+127.0.0.1	root	MASTER_PORT	1	master-bin.001	79	slave-relay-bin.002	120	master-bin.001	Yes	Yes			0		0	79	124
 change master to master_log_pos=73;
 slave stop;
 change master to master_log_pos=73;

sql/sql_select.cc

@@ -2173,7 +2173,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
       join->positions[idx].table= s;
       if (!best_key && idx == join->const_tables &&
 	  s->table == join->sort_by_table &&
-	  join->thd->select_limit >= records)
+	  join->unit->select_limit_cnt >= records)
 	join->sort_by_table= (TABLE*) 1;	// Must use temporary table
 
      /*