fix dir separators in test

Author: weltling

ext/standard/tests/serialize/bug68044.phpt

@@ -6,7 +6,7 @@ Bug #68044 Integer overflow in unserialize() (32-bits only)
 ?>
 ===DONE==
 --EXPECTF--
-Warning: Insufficient data for unserializing - %d required, 1 present in %s/bug68044.php on line 2
+Warning: Insufficient data for unserializing - %d required, 1 present in %s%ebug68044.php on line 2
 
-Notice: unserialize(): Error at offset 32 of 33 bytes in %s/bug68044.php on line 2
+Notice: unserialize(): Error at offset 32 of 33 bytes in %s%ebug68044.php on line 2
 ===DONE==