PORT: Fix sys/resource.h handling for SCO 3.x platform.

Submitted by: M. Laak <maert@proinv.ee>
PR: 3108


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82212 13f79535-47bb-0310-9956-ffa450edef68