TROR blocks enemies

Bisect-compiled to r7443-3f3ce8f1 / svn7450

Forum: https://forums.duke4.net/topic/10751-enemies-are-broken-on-tror-barriers/

As of r7481-422afced / svn7488 the player can't leave the trench as well, fixed at r7538-337afdee / svn7545 (Maybe this info is helpful.)

Reproduce: vp024-BuildGameTest.zip