Merge r1756611, r1748155 from trunk:

mod_dav: follow up to r1746207:  fix typo (missing '/') for closing tag.



mod_dav: making mod_dav.h compile with clang again
Submitted by: ylavic, icing
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757673 13f79535-47bb-0310-9956-ffa450edef68