Remove unused enum (enum open_table_mode).

It was added by mistake during backport from 6.0.

sql/sql_base.h

@@ -17,7 +17,6 @@
 #define SQL_BASE_INCLUDED
 
 #include "unireg.h"                    // REQUIRED: for other includes
-#include "table.h"                              /* open_table_mode */
 #include "sql_trigger.h"                        /* trg_event_type */
 #include "sql_class.h"                          /* enum_mark_columns */
 #include "mysqld.h"                             /* key_map */

sql/table.h

@@ -83,18 +83,6 @@ enum enum_table_ref_type
 };
 
 
-/**
-  Opening modes for open_temporary_table and open_table_from_share
-*/
-
-enum open_table_mode
-{
-  OTM_OPEN= 0,
-  OTM_CREATE= 1,
-  OTM_ALTER= 2
-};
-
-
 /*************************************************************************/
 
 /**