avoid "It turns into it"

<Someone> drew attention to the silly message in the newsgroup

Since I'm not sure if the act of polymorphing has a sound,
I opted to use a new usmellmon() routine to put out a
message based on the smell of the resulting monster
under those circumstances.

Not every monster has a recognizable smell, so no
message at all is given in that case.

olfactory(youmonst.data) will determine whether
you are capable of detecting smells.

There is lots of room for enhancement, and some of the
existing smell-related messages in the source should perhaps
be checking olfactory(youmonst.data) too, but this patch
doesn't go that far.

doc/fixes34.4

@@ -13,6 +13,7 @@ trap messages referring to named steed were ackwardly worded when hallucination
 	overrode use of the name
 some actions such as eating corpses off the floor didn't check whether hero
 	could reach the bottom of a pit
+usmellmon() instead of "It turns into it" during monster polymorph
 
 
 Platform- and/or Interface-Specific Fixes