Get rid of the xlate version of ap_md5_digest()

since we don't compute digests of filtered (e.g., translated)
response bodies this way anymore.  (Note that we don't do it at
all at the present; somebody needs to write a filter to do so.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86750 13f79535-47bb-0310-9956-ffa450edef68