Fix conflicts between tests with obscure filenames

For non-windows tests

Author: villfa

ext/standard/tests/file/file_get_contents_variation8.phpt

@@ -8,6 +8,8 @@ if (substr(PHP_OS, 0, 3) == 'WIN') {
     die('skip.. Not valid for Windows');
 }
 ?>
+--CONFLICTS--
+obscure_filename
 --FILE--
 <?php
 /* Prototype  : string file_get_contents(string filename [, bool use_include_path [, resource context [, long offset [, long maxlen]]]])