Always use 3D clipping when linked portals are active.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2391 86ba831e-150c-0410-ab35-e06eaae15ed9
Changelog entries for 12/15 to present. This commit is dedicated to the memory of my precious "fur face", Nikki Fritz, may she rest in peace.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2392 86ba831e-150c-0410-ab35-e06eaae15ed9