Followup patch: innodb_zip.wl5522_debug_zip fails on windows.

fil_tablespace_iterate() does:

file = os_file_create_simple_no_error_handling(... &success)
DBUG_EXECUTE_IF(....)
if (!success) {
   /* The following call prints an error message */
   os_file_get_last_error(true);
}

Before the patch:
os_file_get_last_error_low() does GetLastError() which returns zero,
because there are intervening system calls (in the implementation of
DBUG_EXECUTE_IF) which do not fail.

After the patch:
os_file_get_last_error_low() does GetLastError() which returns 32,
since there are no more intervening system calls. So we get a couple
of more warnings.

Fix: add suppressions for new warnings.

Also: remove unused function ut_rnd_set_seed()