Description:
------------
When removing an iterator from a liststore in the foreach() callback, php crashes with
*** glibc detected *** double free or corruption (fasttop): 0x08d92758 ***



Reproduce code:
---------------
<?php
$ls = new GtkListStore(Gtk::TYPE_STRING);
$ls->append(array('test'));
$ls->foreach('foreachList');
function foreachList($ls, $path, $iter) {
    $ls->remove($iter);
}
?>