git pull request #133 - reassess worn equipment

Fixes #133

Monsters who lost an amulet of life saving while having their life
saved wouldn't attempt to put on another amulet unless/until they
picked up some object.  Likewise if they had a worn item stolen.
(There are probably other events which should re-check worn gear.)

The suggested commit had a life-saved monster re-check equipment
during life-saving which might have led to reports about them
effectively getting extra moves, especially if two-weapon fighting
or zap rebound with sequence of kill/life-save/kill-again allowed
the target to put on a replacement amulet of life-saving prior to
the second kill.  It also wasn't amenable to dealing with stolen
equipment.  This alternate fix sets a flag to have monster check
its equipment on its next move.

src/mhitm.c

@@ -1268,6 +1268,9 @@ register struct attack *mattk;
                     mwepgone(mdef);
                 otmp->owornmask = 0L;
                 update_mon_intrinsics(mdef, otmp, FALSE, FALSE);
+                /* give monster a chance to wear other equipment on its next
+                   move instead of waiting until it picks something up */
+                mdef->misc_worn_check |= I_SPECIAL;
             }
             /* add_to_minv() might free otmp [if it merges] */
             if (vis)