Merge r1407248 from trunk:

  *) mod_xml2enc: Fix problems with charset conversion altering the
     Content-Length. [Micha Lenk <micha lenk info>]
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1422871 13f79535-47bb-0310-9956-ffa450edef68