Allow building httpd without a built-in MPM by specifying

  --with-mpm=shared

on configure.  When built thusly, an MPM should be loaded via LoadModule.

(Currently you need to build the MPM with apxs.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@757999 13f79535-47bb-0310-9956-ffa450edef68