dipping non-weapon iron in fountain

<email deleted> wrote:
> Non-weapon iron items don't appear to rust if #dipped in a fountain.

Fixed. If something does get rusted, its a 50/50 chance whether other
fountain effects take place on the item afterwards.

doc/fixes34.3

@@ -48,6 +48,8 @@ bill for all discarded, opened tins
 monsters that cannot pick things up cannot throw things either
 eating an amulet of unchanging removes intrinsic polymorph
 Vlad won't waste time trying to use wand of digging in his own tower
+non-weapon iron objects should rust when dipped in fountains since
+	iron weapons rust
 
 
 Platform- and/or Interface-Specific Fixes