Description:
------------
This error is reported when i try execute a script that print some kind of text (GtkLabel, GtkButton, etc). The script run correctly, but without texts.

The message:
(hello.php-gtk:4294627475): GLib-CRITICAL **: file gconvert.c: line 500 (g_convert): assertion `from_codeset != NULL' failed

I set in my php.ini this line:
php-gtk.codepage = CP1252
but still don?t work.

Reproduce code:
---------------
<?php
if (!extension_loaded('gtk')) {
	dl( 'php_gtk.' . PHP_SHLIB_SUFFIX);
}

$window = &new GtkWindow();
$window->set_border_width(10);

$button = &new GtkButton('Hello World!');
$window->add($button);

$window->show_all();

Gtk::main();
?>

Expected result:
----------------
A window with button saying "Hello Word!".

Actual result:
--------------
A window with empty button and a the message: (hello.php-gtk:4294627475): GLib-CRITICAL **: file gconvert.c: line 500 (g_convert): assertion `from_codeset != NULL' failed