#6095: OpenGL2: Use areamask and leaf cluster for PVS when VIS is missing.

code/renderergl2/tr_bsp.c

@@ -600,8 +600,6 @@ static	void R_LoadVisibility( lump_t *l ) {
 	byte	*buf;
 
 	len = ( s_worldData.numClusters + 63 ) & ~63;
-	s_worldData.novis = ri.Hunk_Alloc( len, h_low );
-	Com_Memset( s_worldData.novis, 0xff, len );
 
     len = l->filelen;
 	if ( !len ) {