Make polymorphing or changing alignment perform a touch check (as is
done when catching lycanthropy) on wielded weapon(s) to see whether the
hero can still use them in his new form. Part [2 of 2] will update
retouch_equipment() to check all items in use rather than just weapon(s).
(A comment or two in part 1 already refers to expected behavior of part 2.)
c86f9ff008