Prevent monsters who kill other monsters to obtain the Amulet from
targetting a priest inside his temple. Blocks players from just staying
on the Sanctum stairs while a teleporting arch-lich or Asmodeus fetchs the
Amulet from Moloch's high priest for them. A previous post-3.4.3 change
prevented monsters from targetting the Wizard; this extends that (and
assumes that we can ignore the possibility of other temple priests ever
handling the Amulet). The earlier patch went into the branch code, but
inhistemple() isn't available there so this one is trunk only.
9df113a973