-Fix a sprite clipping bug where a drawseg would clip the full range of a sprite's columns when part of a sprite is in front of a drawseg and part of the sprite is behind the drawseg (bug 901).
-Currently the sprite will considered entirely in front of the drawseg. There is #if 0'd code to clip only the portion of the sprite behind where the drawseg and sprite intersect but it works poorly with bullet puffs in front of midtexture banners.

git-svn-id: http://odamex.net/svn/root/branches/rend32@3974 b0bcef46-2027-0410-bd56-ab726e9a1d04