B12004 polymorphing into minotaur

B12004 polymorphing into minotaur
Polymorphing into creature with horns such as a minotaur,
will cause your helmet to fall off if it is made of a hard material.

Only minotaurs pass the has_horns() test in include/mondata.h
because the complaint specifically referred to them, but that
should perhaps be reviewed at some point by someone who is
certain which creatures have horns growing from their
head (some demons?)