Forgotten file needed for r1612934.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1612940 13f79535-47bb-0310-9956-ffa450edef68
Re-introduce check for sufficient PCRE version.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1612945 13f79535-47bb-0310-9956-ffa450edef68