Revision 1758204

In mod_dav_svn, factor out three functions responsible for sending
the header, trailer and a single entry of the collection.

This lays the groundwork required for switching to dav_svn__brigade
functions whenever we write something to the output filter stack.
And this switch would be required to fix the unbounded memory usage
when mod_dav_svn is paired up with mod_headers or mod_deflate.

* subversion/mod_dav_svn/repos.c
  (deliver): Factor out parts responsible for sending the header, trailer
   and the entry of the collection into ...
  (emit_collection_head, emit_collection_tail, emit_collection_entry):
   ...these new functions.