We need to test specifically for setrlimit/getrlimit instead of

just the structure or the RLIMIT_* defines. Also, we should make
the API function unixd_set_rlimit() ``available'' even if it
doesn't do anything.
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86143 13f79535-47bb-0310-9956-ffa450edef68