Add more test case for locale ß and ss

Author: youkidearitai

ext/intl/tests/grapheme_strpos_locale_dependency.phpt

@@ -0,0 +1,12 @@
+--TEST--
+grapheme_strpos() function locale dependency test
+--EXTENSIONS--
+intl
+--FILE--
+<?php
+var_dump(grapheme_strpos("ß", "ss", 0, locale: "en_US"));
+var_dump(grapheme_strpos("ß", "ss", 0, locale: "de_DE-u-ks-level1"));
+?>
+--EXPECT--
+bool(false)
+int(0)