more phg8 compat

Author: romainmenke

lib/aws-sdk/Guzzle/Http/Message/Response.php

@@ -879,7 +879,10 @@ public function xml()
     {
         $errorMessage = null;
         $internalErrors = libxml_use_internal_errors(true);
-        $disableEntities = libxml_disable_entity_loader(true);
+        $disableEntities = true;
+        if (\PHP_VERSION_ID < 80000) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
         libxml_clear_errors();
 
         try {
@@ -893,7 +896,10 @@ public function xml()
 
         libxml_clear_errors();
         libxml_use_internal_errors($internalErrors);
-        libxml_disable_entity_loader($disableEntities);
+
+        if (\PHP_VERSION_ID < 80000) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         if ($errorMessage) {
             throw new RuntimeException('Unable to parse response body into XML: ' . $errorMessage);