fix dir separator in cve-2013-6420 test

Author: weltling

ext/openssl/tests/cve-2013-6420.phpt

@@ -12,7 +12,7 @@ var_dump($info['issuer']['emailAddress'], $info["validFrom_time_t"]);
 ?>
 Done
 --EXPECTF--
-%s openssl_x509_parse(): illegal ASN1 data type for timestamp in %s/cve-2013-6420.php on line 3
+%s openssl_x509_parse(): illegal ASN1 data type for timestamp in %s%ecve-2013-6420.php on line 3
 string(27) "stefan.esser@sektioneins.de"
 int(-1)
 Done