mod_lua: Add a fixups hook that checks if the original request is intended for LuaMapHandler. This fixes a bug where FallbackResource invalidates the LuaMapHandler directive in certain cases by changing the URI before the map handler code executes.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1576981 13f79535-47bb-0310-9956-ffa450edef68