These changes are committed together, because they depend on each other.

    -   shared modules can be built in the tree
    -   added support for --with-layout, uses APACI's config.layout
    -   working 'make install'
    -   working 'make depend'
    -   working Pthreads checks
    -   buildconf replaced


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84423 13f79535-47bb-0310-9956-ffa450edef68