Add test case for bug GH-16944

Author: derickr

ext/filter/tests/gh16944.phpt

@@ -0,0 +1,10 @@
+--TEST--
+Bug GH-16944 (Invalid filtering of IPv6 with FILTER_FLAG_NO_RES_RANGE)
+--EXTENSIONS--
+filter
+--FILE--
+<?php
+var_dump(filter_var("::ffff:0:1", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE));
+?>
+--EXPECT--
+bool(false)