fix #H5486 - artifact naming vs illiterate

Attempting to name the relevant type of item with an artifact's name
(such as a runesword with "Stormbringer") fails with "your hand
slips" in order to prevent turning the item into an aritfact.  Since
that only happens when the name is valid, it indicates that the hero
is literate so violate illiterate conduct.

(Naming items in general doesn't affect [il]literacy so that player
can assign names to inventory or stash items to maintain notes.)

doc/fixes36.1

@@ -427,6 +427,8 @@ when configured with DUMPLOG enabled, artifacts were counted twice towards
 once Moloch's Sanctum (or Astral Plane via wizard mode level teleport direct
 	to end-game) was entered, end of game disclosure would reveal that
 	high priests had been incorrectly flagged as extinct
+attempting to name an item as an artifact and failing via hand slip violates
+	illiterate conduct
 
 
 Platform- and/or Interface-Specific Fixes

src/do_name.c

@@ -1,4 +1,4 @@
-/* NetHack 3.6	do_name.c	$NHDT-Date: 1489494376 2017/03/14 12:26:16 $  $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.116 $ */
+/* NetHack 3.6	do_name.c	$NHDT-Date: 1495494156 2017/05/22 23:02:36 $  $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.118 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1081,6 +1081,9 @@ register struct obj *obj;
         pline("While engraving, your %s slips.", body_part(HAND));
         display_nhwindow(WIN_MESSAGE, FALSE);
         You("engrave: \"%s\".", buf);
+        /* violate illiteracy conduct since hero attempted to write
+           a valid artifact name */
+        u.uconduct.literate++;
     }
     ++via_naming; /* This ought to be an argument rather than a static... */
     obj = oname(obj, buf);