Avoid infinite looping in APACI's configure script

inside Ultrix' /bin/sh5 upgrade step.

Submitted by: Jan Gallo <gallo@viapvt.sk>, Ralf S. Engelschall
Reviewed by: Ralf S. Engelschall
PR: 4940


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84584 13f79535-47bb-0310-9956-ffa450edef68