fix `rewritecond expr` regression in 2.4.64

fix `rewritecond expr` regression in 2.4.64

  *) SECURITY: CVE-2025-54090: Apache HTTP Server: 'RewriteCond expr'
     always evaluates to true in 2.4.64 (cve.mitre.org)
     A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond
     expr ..." tests evaluating as "true".
     Users are recommended to upgrade to version 2.4.65, which fixes
     the issue.

Reviewed By: covener, ylavic, gbechis, jorton

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1927361 13f79535-47bb-0310-9956-ffa450edef68