Because the redirect-request survives logging, we don't have the

same exposure as subrequests, and this change would have doubled
the headers.  Revert this bit of the headers_in 'consistification'

Noted by rpluem.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@901589 13f79535-47bb-0310-9956-ffa450edef68