* Ensure that the new table values are allocated from the pool of the main

  request as they might be added to the header tables of the main request.
  Otherwise these values might become invalid once the subrequest and its
  pool gets destroyed.

PR: 48359
Submitted by: rpluem, niq
Reviewed by: niq


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@889408 13f79535-47bb-0310-9956-ffa450edef68