Merge branch 'skybox-sprites-fix' into 'master'

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.

See merge request !84

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();