Do not draw segs that belong to polyobjects, if you're drawing subsectors adjacent to them

Polyobject segs should ONLY be drawn if the polyobject itself is in the polylist of a subsector being rendered. That way you won't sometimes see polyobject walls through level boundaries, if you happen to be close enough to their pre-spawn locations outside the level (or in them, if you decided to go on a noclip journey).

src/hardware/hw_main.c

@@ -3722,6 +3722,9 @@ static void HWR_Subsector(size_t num)
 
 		while (count--)
 		{
+#ifdef POLYOBJECTS
+				if (!line->polyseg) // ignore segs that belong to polyobjects
+#endif
 				HWR_AddLine(line);
 				line++;
 		}

src/r_bsp.c

@@ -1222,6 +1222,9 @@ static void R_Subsector(size_t num)
 	while (count--)
 	{
 //		CONS_Debug(DBG_GAMELOGIC, "Adding normal line %d...(%d)\n", line->linedef-lines, leveltime);
+#ifdef POLYOBJECTS
+		if (!line->polyseg) // ignore segs that belong to polyobjects
+#endif
 		R_AddLine(line);
 		line++;
 		curline = NULL; /* cph 2001/11/18 - must clear curline now we're done with it, so stuff doesn't try using it for other things */