Removing old pre_41 zend_module_entry struct checks while loading exts

All is into the title. A patch can be found here https://github.com/jpauli/php-src/compare/remove_dl_php4_support The idea is to get rid of those old stuff, like we did with session.compat some time ago. If you have ideas, improvements ... Joe also talked about adding a header to the zend_module_entry struct, to prevent us from hacking dl() like its been done for pre41. Kalle also talked about a way to make extension load in a particular order, the RFC is here : https://wiki.php.net/rfc/extensions_load_order Julien.Pauli