lpbug#665028 SHOW STORAGE ENGINES shows incorrect Transaction support for Aria

don't fill in handlerton::commit member, as it's not used
and makes MySQL believe that Aria is transactional.
Fix the TRANSACTIONAL=1 warning.

mysql-test/suite/maria/r/maria.result

 select * from INFORMATION_SCHEMA.ENGINES where ENGINE="ARIA";
 ENGINE	SUPPORT	COMMENT	TRANSACTIONS	XA	SAVEPOINTS
-Aria	YES	Crash-safe tables with MyISAM heritage	YES	NO	NO
+Aria	YES	Crash-safe tables with MyISAM heritage	NO	NO	NO
 set global storage_engine=aria;
 set session storage_engine=aria;
 set global aria_page_checksum=0;

mysql-test/suite/maria/r/maria3.result

 select * from INFORMATION_SCHEMA.ENGINES where ENGINE="ARIA";
 ENGINE	SUPPORT	COMMENT	TRANSACTIONS	XA	SAVEPOINTS
-Aria	YES	Crash-safe tables with MyISAM heritage	YES	NO	NO
+Aria	YES	Crash-safe tables with MyISAM heritage	NO	NO	NO
 set global storage_engine=aria;
 set session storage_engine=aria;
 set global aria_page_checksum=0;

sql/sql_table.cc

@@ -3929,12 +3929,16 @@ bool mysql_create_table_no_lock(THD *thd,
   }
 
   /* Give warnings for not supported table options */
-  if (create_info->transactional && !file->ht->commit)
-    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
-                        ER_ILLEGAL_HA_CREATE_OPTION,
-                        ER(ER_ILLEGAL_HA_CREATE_OPTION),
-                        file->engine_name()->str,
-                        "TRANSACTIONAL=1");
+#if defined(WITH_ARIA_STORAGE_ENGINE)
+  extern handlerton *maria_hton;
+  if (file->ht != maria_hton)
+#endif
+    if (create_info->transactional)
+      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
+                          ER_ILLEGAL_HA_CREATE_OPTION,
+                          ER(ER_ILLEGAL_HA_CREATE_OPTION),
+                          file->engine_name()->str,
+                          "TRANSACTIONAL=1");
 
   VOID(pthread_mutex_lock(&LOCK_open));
   if (!internal_tmp_table && !(create_info->options & HA_LEX_CREATE_TMP_TABLE))

storage/maria/ha_maria.cc

@@ -3302,6 +3302,9 @@ static int ha_maria_init(void *p)
   maria_hton->panic= maria_hton_panic;
   maria_hton->commit= maria_commit;
   maria_hton->rollback= maria_rollback;
+#ifdef MARIA_CANNOT_ROLLBACK
+  maria_hton->commit= 0;
+#endif
   maria_hton->flush_logs= maria_flush_logs;
   maria_hton->show_status= maria_show_status;
   /* TODO: decide if we support Maria being used for log tables */