Move and fix scandir related bug test

Author: Girgias

ext/standard/tests/dir/bug41693.phpt

@@ -0,0 +1,14 @@
+--TEST--
+Bug #41693 (scandir() allows empty directory names)
+--FILE--
+<?php
+
+try {
+    var_dump(scandir(''));
+} catch (\Error $e) {
+    echo $e->getMessage() . "\n";
+}
+
+?>
+--EXPECT--
+Directory name cannot be empty