Post-review fix for BUG#12712: SET AUTOCOMMIT should fail within SP/functions/triggers

mysql-test/r/sp.result:
  Added missing drop table.
mysql-test/t/sp.test:
  Added missing drop table.
sql/sp_head.h:
  Post-review fix for autocommit check in SPs and triggers.
sql/sql_yacc.yy:
  Post-review fix for autocommit check in SPs and triggers.

mysql-test/r/sp.result

@@ -3323,6 +3323,7 @@ drop function bug12379|
 drop procedure bug12379_1|
 drop procedure bug12379_2|
 drop procedure bug12379_3|
+drop table t3|
 drop procedure if exists bug13124|
 create procedure bug13124()
 begin

mysql-test/t/sp.test

@@ -4161,6 +4161,7 @@ drop function bug12379|
 drop procedure bug12379_1|
 drop procedure bug12379_2|
 drop procedure bug12379_3|
+drop table t3|
 
 #
 # Bug #13124    Stored Procedure using SELECT INTO crashes server

sql/sp_head.h

@@ -285,7 +285,8 @@ class sp_head :private Query_arena
       my_error(ER_SP_NO_RETSET, MYF(0), where);
     else if (m_flags & HAS_SET_AUTOCOMMIT_STMT)
       my_error(ER_SP_CANT_SET_AUTOCOMMIT, MYF(0));
-    return test(m_flags & (CONTAINS_DYNAMIC_SQL|MULTI_RESULTS));
+    return test(m_flags &
+		(CONTAINS_DYNAMIC_SQL|MULTI_RESULTS|HAS_SET_AUTOCOMMIT_STMT));
   }
 private:
 

sql/sql_yacc.yy

@@ -8005,8 +8005,7 @@ internal_variable_name:
             if (tmp == &sys_time_zone &&
                 lex->add_time_zone_tables_to_query_tables(YYTHD))
               YYABORT;
-            else
-              if (spc && tmp == &sys_autocommit)
+            else if (spc && tmp == &sys_autocommit)
             {
               /*
                 We don't allow setting AUTOCOMMIT from a stored function