Sunsword vs shades, take II (trunk only)

From the newsgroup:  Sunsword is ineffective against shades.  It
gets a special bonus of double damage vs undead, but since it's not made
of silver it was only doing 1 point of damage against shades.  Make the
bonus-vs-undead attribute override the silver-required criterion.  (No
comparable handling for flimsy weapons against thick-skinned critters
this time.)

src/uhitm.c

@@ -611,7 +611,7 @@ int thrown;		/* HMON_xxx (0 => hand-to-hand, other => ranged) */
 		    (is_ammo(obj) && (thrown != HMON_THROWN ||
 				      !ammo_and_launcher(obj, uwep)))) {
 		    /* then do only 1-2 points of damage */
-		    if (mdat == &mons[PM_SHADE] && obj->otyp != SILVER_ARROW)
+		    if (mdat == &mons[PM_SHADE] && !shade_glare(obj))
 			tmp = 0;
 		    else
 			tmp = rnd(2);