Added blurb on object comparisons in PHP4
Known bug: make html does not copy the PNG from images to the correct dir
Someone with more insight on what to change in configure.in and related
can do the changes (don't want to break the build).
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@121878 c90b9560-bf6c-de11-be94-00142212c4b1