Convert resource to object in XML-RPC extension

Closes GH-5457

Author: kocsismate

UPGRADING

@@ -434,6 +434,12 @@ PHP 8.0 UPGRADE NOTES
     instead the XmlParser instance is automatically destroyed if it is no longer
     referenced.
 
+- XML-RPC:
+  . xmlrpc_server_create() will now return an XmlRpcServer object rather than a resource.
+    The xmlrpc_server_destroy() function no longer has an effect,
+    instead the XmlRpcServer instance is automatically destroyed if it is no longer
+    referenced.
+
 - XMLWriter:
   . The XMLWriter functions now accept and return, respectively, XMLWriter
     objects instead of resources.