Fix UTF-8 handling in php_url_parse_ex2

ext/standard/tests/url/url_utf8.phpt

@@ -0,0 +1,10 @@
+--TEST--
+Uri: hostnames should be preserved in Unicode form
+--FILE--
+<?php
+
+$parsed = parse_url('http://ουτοπία.δπθ.gr/');
+var_dump($parsed['host']);
+?>
+--EXPECT--
+string(24) "ουτοπία.δπθ.gr"

ext/standard/url.c

@@ -55,11 +55,11 @@ static void php_replace_controlchars(char *str, size_t len)
 	ZEND_ASSERT(str != NULL);
 
 	while (s < e) {
-		if (iscntrl(*s)) {
-			*s='_';
+        if (*s <= 0x1F || *s == 0x7F) {   
+			*s = '_'; 
 		}
-		s++;
-	}
+        s++;
+    }
 }
 
 PHPAPI php_url *php_url_parse(char const *str)