Fold in backport of 2.0 fix for mod_usertrack core dump

when enabled but no explicit CookieName is set.

PR: 24483(Bugz)
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@102319 13f79535-47bb-0310-9956-ffa450edef68