Fix hook sorting for the pre_config hook.

Move modules/http/config2.m4 back to modules/http/config.m4, since this was
only done as work-around in r88887 for the broken hook-sorting.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1032002 13f79535-47bb-0310-9956-ffa450edef68