Extensions and SAPI removed from PHP7
删除了：
- cow/aolserver
- cow/apache- cow/apache_hooks
- cow/apache2filter
- cow/caudium
- cow/continuity
- cow/isapi
- cow/milter
- cow/nsapi
- cow/phttpd
- cow/pi3web
- cow/roxen
- cow/thttpd
- cow/tux
- cow/webjames
- ext/mssql
- ext/mysql
- ext/sybase_ct
- ext/ereg
参考资料：
https://wiki.php.net/rfc/removal_of_dead_sapis_and_exts
https://wiki.php.net/rfc/remove_deprecated_functionality_in_php7
