adjust default module enablement to kinda-sorta sync with
autoconf-based build (see commentary added as part of this
revision

sync-ing is limited by 

* not all modules with prereqs can be built yet
* no infrastructure yet to control related modules together (e.g.,
  enabling mod_proxy also enables a slew of others)



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1518859 13f79535-47bb-0310-9956-ffa450edef68