Silly shapechange message if <mon> is sensed via telepathy and takes
on a mindless form. In the case I noticed, it was a doppelganger on
the far side of a maze wall who changed from something ordinary into
a mummy while the hero was wearing an amulet of esp.
3.6.0 could deliver this message, but I think changes since then have
increased the chance for newcham() to give shapechange feedback.
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