Merge changes to GL_Cull from Rend2 into opengl1 renderer, behavior is the same.

code/renderer/tr_backend.c

@@ -134,30 +134,16 @@ void GL_Cull( int cullType ) {
 	} 
 	else 
 	{
+		qboolean cullFront;
 		qglEnable( GL_CULL_FACE );
 
-		if ( cullType == CT_BACK_SIDED )
+		cullFront = (cullType == CT_FRONT_SIDED);
+		if ( backEnd.viewParms.isMirror )
 		{
-			if ( backEnd.viewParms.isMirror )
-			{
-				qglCullFace( GL_FRONT );
-			}
-			else
-			{
-				qglCullFace( GL_BACK );
-			}
-		}
-		else
-		{
-			if ( backEnd.viewParms.isMirror )
-			{
-				qglCullFace( GL_BACK );
-			}
-			else
-			{
-				qglCullFace( GL_FRONT );
-			}
+			cullFront = !cullFront;
 		}
+
+		qglCullFace( cullFront ? GL_FRONT : GL_BACK );
 	}
 }