Improvements to APXS. It now uses the config_vars.mk variables to

figure out how to build stuff.  It uses the Apache build system for
the generated module, but not for command line builds.  Maybe I'll fix
that one day.  If somebody wants to beat me to it, that would be cool.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90696 13f79535-47bb-0310-9956-ffa450edef68