fix dir separator in test

Author: weltling

ext/exif/tests/bug68113.phpt

@@ -10,8 +10,8 @@ var_dump(exif_thumbnail(__DIR__."/bug68113.jpg"));
 ?>
 Done
 --EXPECTF--
-Warning: exif_thumbnail(bug68113.jpg): File structure corrupted in %s/bug68113.php on line 2
+Warning: exif_thumbnail(bug68113.jpg): File structure corrupted in %s%ebug68113.php on line 2
 
-Warning: exif_thumbnail(bug68113.jpg): Invalid JPEG file in %s/bug68113.php on line 2
+Warning: exif_thumbnail(bug68113.jpg): Invalid JPEG file in %s%ebug68113.php on line 2
 bool(false)
-Done
+Done