don't negate new moon with a lizard corpse

The only effect of a new moon was to make hearing a cockatrice's
hissing (whichs happens with 1 in 3 chance) always start the turn to
stone sequence instead just having a 1 in 10 chance to do so, but
that was negated by carrying a lizard corpse.

Keep the hiss-always-starts-petficiation part and remove the
carrying-a-lizard-corpse-negates-that part.  So the effect of a new
moon no longer gets controlled by the contents of hero's inventory.

src/invent.c

@@ -1334,17 +1334,6 @@ currency(long amount)
     return res;
 }
 
-boolean
-have_lizard(void)
-{
-    register struct obj *otmp;
-
-    for (otmp = g.invent; otmp; otmp = otmp->nobj)
-        if (otmp->otyp == CORPSE && otmp->corpsenm == PM_LIZARD)
-            return  TRUE;
-    return FALSE;
-}
-
 struct obj *
 u_carried_gloves(void) {
     struct obj *otmp, *gloves = (struct obj *) 0;