branches/zip rb://152

Disable display of deprecated parameter innodb_file_io_threads in
'show variables'.

handler/ha_innodb.cc

@@ -9878,7 +9878,7 @@ static MYSQL_SYSVAR_ULONG(concurrency_tickets, srv_n_free_tickets_to_enter,
   NULL, NULL, 500L, 1L, ~0L, 0);
 
 static MYSQL_SYSVAR_LONG(file_io_threads, innobase_file_io_threads,
-  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY | PLUGIN_VAR_NOSYSVAR,
   "Number of file I/O threads in InnoDB.",
   NULL, NULL, 4, 4, 64, 0);