Fix a problem in the new --enable-layout functionality where

it wouldn't allow overrides from variables like --prefix,
--bindir, etc.

Mention my fix to the core input filter for the AP_MODE_EXHAUSTIVE case.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93739 13f79535-47bb-0310-9956-ffa450edef68