Automatically identify some obsolete items.

Add food and rods to the "always known" list in item_type_known(). This
restores the behaviour from before 008097b, in that you are no
longer asked to identify "removed food" items.

crawl-ref/source/item-name.cc

@@ -1943,6 +1943,10 @@ bool item_type_known(const item_def& item)
     case OBJ_GOLD:
     case OBJ_RUNES:
     case OBJ_GEMS:
+#if TAG_MAJOR_VERSION == 34
+    case OBJ_FOOD:
+    case OBJ_RODS:
+#endif
         return true;
     default:
         break;