Temporarily disable part of test for libxml 2.12.0 regression

See https://gitlab.gnome.org/GNOME/libxml2/-/issues/634

Author: nielsdos

ext/dom/tests/DOMNode_isEqualNode.phpt

@@ -200,7 +200,8 @@ echo "--- Test documents ---\n";
 $dom1Clone = clone $dom1;
 var_dump($dom1->documentElement->isEqualNode($dom1Clone->documentElement));
 var_dump($dom1->documentElement->isEqualNode($dom2->documentElement));
-var_dump($dom1->isEqualNode($dom1Clone));
+// TODO: re-enable this once this is figured out: https://gitlab.gnome.org/GNOME/libxml2/-/issues/634
+//var_dump($dom1->isEqualNode($dom1Clone));
 var_dump($dom1->isEqualNode($dom2));
 var_dump($dom1->documentElement->isEqualNode($dom1Clone));
 var_dump($dom1->documentElement->isEqualNode($dom2));
@@ -343,7 +344,6 @@ bool(false)
 --- Test documents ---
 bool(true)
 bool(false)
-bool(true)
 bool(false)
 bool(false)
 bool(false)