Bug#27145 EXTRA_ACL troubles

The flag EXTRA_ACL is used in conjugation with our access checks, yet it is
not clear what impact this flag has.
This is a code clean up which replaces use of EXTRA_ACL with an explicit
function parameter.
The patch also fixes privilege checks for:
- SHOW CREATE TABLE: The new privilege requirement is any privilege on
  the table-level.
- CHECKSUM TABLE: Requires SELECT on the table level.
- SHOW CREATE VIEW: Requires SHOW_VIEW and SELECT on the table level
  (just as the manual claims)
- SHOW INDEX: Requires any privilege on any column combination.

sql/sql_acl.h

@@ -51,7 +51,6 @@
   4. acl_init() or whatever - to define behaviour for old privilege tables
   5. sql_yacc.yy - for GRANT/REVOKE to work
 */
-#define EXTRA_ACL	(1L << 29)
 #define NO_ACCESS	(1L << 30)
 #define DB_ACLS \
 (UPDATE_ACL | SELECT_ACL | INSERT_ACL | DELETE_ACL | CREATE_ACL | DROP_ACL | \
@@ -238,7 +237,7 @@ my_bool grant_init();
 void grant_free(void);
 my_bool grant_reload(THD *thd);
 bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
-		 uint show_command, uint number, bool dont_print_error);
+                 bool any_combination_will_do, uint number, bool no_errors);
 bool check_grant_column (THD *thd, GRANT_INFO *grant,
 			 const char *db_name, const char *table_name,
 			 const char *name, uint length, Security_context *sctx);
@@ -269,6 +268,9 @@ bool sp_grant_privileges(THD *thd, const char *sp_db, const char *sp_name,
 bool check_routine_level_acl(THD *thd, const char *db, const char *name,
                              bool is_proc);
 bool is_acl_user(const char *host, const char *user);
+bool has_any_table_level_privileges(THD *thd, ulong required_access,
+                                    TABLE_LIST *tables);
+
 #ifdef NO_EMBEDDED_ACCESS_CHECKS
 #define check_grant(A,B,C,D,E,F) 0
 #define check_grant_db(A,B) 0