Merge r1407965 from trunk:

Replace an incorrect #if by the correct corresponding #if defined(...)

PR 54133 reported by Teodor Milkov ()
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1408296 13f79535-47bb-0310-9956-ffa450edef68