* Updated to ZDoom 4225:
- Fixed: r4220 broke 3D floor rendering in software, because 3D floors have the floor and ceiling orientations reversed compared to normal conventions. [OpenGL wasn't affected by the change in r4220.]

git-svn-id: http://mancubus.net/svn/hosted/gzdoom/trunk@1555 b0f79afe-0144-0410-b225-9a4edf0717df