Fix GH-16237: Segmentation fault when cloning SoapServer

Bisect points to 94ee4f9, however this only reveals the problem.
Cloning an object on a lower branch and trying to call its methods
crashes as well. Cloning the object shouldn't be possible in the first
place because there's an engine constraint that when we have a new
object handler we should also have a clone handler. This constraint is
not fulfilled here.

Closes GH-16245.

NEWS

@@ -70,6 +70,7 @@ PHP                                                                        NEWS
 
 - SOAP:
   . Fixed bug #62900 (Wrong namespace on xsd import error message). (nielsdos)
+  . Fixed bug GH-16237 (Segmentation fault when cloning SoapServer). (nielsdos)
 
 - Standard:
   . Fixed bug GH-15613 (overflow on unpack call hex string repeater).

ext/soap/soap.c

@@ -412,6 +412,7 @@ PHP_MINIT_FUNCTION(soap)
 	memcpy(&soap_server_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
 	soap_server_object_handlers.offset = XtOffsetOf(soap_server_object, std);
 	soap_server_object_handlers.free_obj = soap_server_object_free;
+	soap_server_object_handlers.clone_obj = NULL;
 
 	/* Register SoapFault class */
 	soap_fault_class_entry = register_class_SoapFault(zend_ce_exception);

ext/soap/tests/bugs/gh16237.phpt

@@ -0,0 +1,17 @@
+--TEST--
+GH-16237 (Segmentation fault when cloning SoapServer)
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+
+$server = new SoapServer(null, ['uri'=>"http://testuri.org"]);
+try {
+    clone $server;
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+Trying to clone an uncloneable object of class SoapServer