If mod_so is compiled into the server, we need to create libexec, even

if there are no shared modules compiled.  This is in keeping with what
we did with Apache 1.3, and it allows APXS to work, even if there were no
shared modules installed initially.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86396 13f79535-47bb-0310-9956-ffa450edef68