make the config.layout file work properly.
- change default layout to be "Apache", as defined in config.layout,
  instead of duplicating (some of) that layout in configure itself.
- change default installation path to /usr/local/apache2

PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88692 13f79535-47bb-0310-9956-ffa450edef68