remove the code to silence lint

Warning facilities on recent compilers are incredibly improved,
so the code to silence "good-old" lint is much less sense.

src/dogmove.c

@@ -312,12 +312,8 @@ dog_eat(struct monst *mtmp,
     /* It's a reward if it's DOGFOOD and the player dropped/threw it.
        We know the player had it if invlet is set. -dlc */
     if (dogfood(mtmp, obj) == DOGFOOD && obj->invlet)
-#ifdef LINT
-        edog->apport = 0;
-#else
         edog->apport += (int) (200L / ((long) edog->dropdist + g.moves
                                        - edog->droptime));
-#endif
     if (mtmp->data == &mons[PM_RUST_MONSTER] && obj->oerodeproof) {
         /* The object's rustproofing is gone now */
         if (obj->unpaid)