Revert "games-server/ut2004-ded: drop vulnerable package"

Revert "games-server/ut2004-ded: drop vulnerable package"

This reverts commit 5e1e96c14effb4f076191f9d8023547cb7e15ff4.

This package was dropped because of CVE-2008-6441 and
CVE-2008-7011. However, UT2004 was reported to *not* be vulnerable to
the former and the latter was almost certainly fixed in 3369.3. I
cannot find any release notes but the published workaround related to
3369.2 and 3369.3 was built just three days after the vulnerability
was announced.

Bug: https://bugs.gentoo.org/285010
Signed-off-by: James Le Cuirot <chewi@gentoo.org>