Fix potential parallel test conflict

Cf. <https://ci.appveyor.com/project/php/php-src/builds/43644961/job/xibhmsbs8panajy2?fullLog=true#L15770>.

Author: cmb69

sapi/cli/tests/argv_mb_bug77111.phpt

@@ -21,7 +21,7 @@ $php = dirname(getenv('TEST_PHP_EXECUTABLE')) . DIRECTORY_SEPARATOR . "php-win.e
 
 $out_fl = __DIR__ . "\\argv_bug77111.txt";
 
-$argv_fl = __DIR__ . DIRECTORY_SEPARATOR . "argv_test.php";
+$argv_fl = __DIR__ . DIRECTORY_SEPARATOR . "argv_bug77111_test.php";
 file_put_contents($argv_fl, "<?php file_put_contents('$out_fl', implode(' ', array_slice(\$argv, 1))); ?>");
 
 `$php -n $argv_fl Ästhetik Æstetik Esthétique Estética Эстетика`;
@@ -31,7 +31,7 @@ var_dump(file_get_contents($out_fl));
 --CLEAN--
 <?php
 $out_fl = __DIR__ . "\\argv_bug77111.txt";
-$argv_fl = __DIR__ . DIRECTORY_SEPARATOR . "argv_test.php";
+$argv_fl = __DIR__ . DIRECTORY_SEPARATOR . "argv_bug77111_test.php";
 unlink($argv_fl);
 unlink($out_fl);
 ?>