disable xlu surface hits with a global to avoid initialization errors with struct flag

src/game/prop.c

@@ -993,9 +993,6 @@ bool shotTestLos(struct coord *gunpos2d, struct coord *gundir2d, struct coord *g
 	RoomNum *roomsptr;
 	struct prop *prop;
 
-	// ignore transparent surfaces
-	hitthing.ignore_xlu = 1;
-
 	shotdata.gunpos3d.x = gunpos3d->x;
 	shotdata.gunpos3d.y = gunpos3d->y;
 	shotdata.gunpos3d.z = gunpos3d->z;