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/rnd.c

@@ -73,17 +73,12 @@ rn2_on_display_rng(register int x)
 #else   /* USE_ISAAC64 */
 
 /* "Rand()"s definition is determined by [OS]conf.h */
-#if defined(LINT) && defined(UNIX) /* rand() is long... */
-extern int rand(void);
-#define RND(x) (rand() % x)
-#else /* LINT */
 #if defined(UNIX) || defined(RANDOM)
 #define RND(x) ((int) (Rand() % (long) (x)))
 #else
 /* Good luck: the bottom order bits are cyclic. */
 #define RND(x) ((int) ((Rand() >> 3) % (x)))
 #endif
-#endif /* LINT */
 int
 rn2_on_display_rng(register int x)
 {
@@ -216,13 +211,8 @@ rne(register int x)
 int
 rnz(int i)
 {
-#ifdef LINT
-    int x = i;
-    int tmp = 1000;
-#else
     register long x = (long) i;
     register long tmp = 1000L;
-#endif
 
     tmp += rn2(1000);
     tmp *= rne(4);