*) include the strings stuff the right way (some platforms use string.h;

   apr_want figures all that out for us)
*) include ap_mpm.h to pick up a moved func declaration


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88102 13f79535-47bb-0310-9956-ffa450edef68