Correct string scope to prevent duplicated values for subsequent tokens.

Submitted by: wrowe
Backports: r1800919
Reviewed by: wrowe, jim, jchampion



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1800955 13f79535-47bb-0310-9956-ffa450edef68