* Refactor setup_bridge_features_builtin().

* Add an error message so you know when a feature is not available and you
tried to use it.  It usually means the module has not been loaded.


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@395316 f38db490-d61c-443f-a65b-d21fe96a405b