Make the dav/main config.m4 file be added to the configure script after

httpd, and make dav default to no if http is not enabled.  Dav still
defaults to yes if http is in the server.  Dav is incredibly HTTP centric,
and makes little to no sense without HTTP


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88827 13f79535-47bb-0310-9956-ffa450edef68