This was comparing an unset property on two objects matched - they do, but the check we actually intend here is that they wrap the same C++ object. We don't seem to be able to accomplish the desired check for PHP, so just disable this for now.
These generate warnings with PHP 7.3, which will become errors in a future version.
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@11434 626c5289-ae23-0410-ae9c-e8d60b6d4f22