Fix for rendering sprites in skyboxes

This branch fixes the visual glitches one sees with sprites for objects within skyboxes, typically with parts of or all of some sprites disappearing from view even though they shouldn't be.

src/r_main.c

@@ -1324,6 +1324,7 @@ void R_RenderPlayerView(player_t *player)
#endif
R_RenderBSPNode((INT32)numnodes - 1);
+		R_ClipSprites();
R_DrawPlanes();
#ifdef FLOORSPLATS
R_DrawVisibleFloorSplats();