Fixes CVE-2012-3345 symlink attack in ioQuake3 based engines
See: http://ioquake3.org/2012/06/14/cve-2012-3345-symlink-attack-in-ioquake3-r1773/

git-svn-id: https://smokinguns.svn.sourceforge.net/svnroot/smokinguns/trunk@667 07eb42f0-b032-4355-afd3-42b1f3832223