From the newsgroup: when an undead monster got killed by a wand
or spell of undead turning, if it left a corpse that corpse would be
hit by the same zap and was immediately revived. This fix uses the
flag bits that were added to prevent objects that are dropped by a
polymorphed monster from being hit by the same polymorph zap.
This also fixes a post-3.3.1 bug that produced "the <undead>
turns to flee" even when that monster had been killed by the turning
attack. 3.3.1 had the same bogus fleeing effect but didn't give any
message so it was unnoticeable.
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