Remove sizeof(int) < 4 related code

src/message.c

@@ -3351,14 +3351,10 @@ int vim_vsnprintf(char *str, size_t str_m, char *fmt, va_list ap, typval_T *tvs)
           else {
             /* Don't put the #if inside memchr(), it can be a
              * macro. */
-#if SIZEOF_INT <= 2
-            char *q = memchr(str_arg, '\0', precision);
-#else
             /* memchr on HP does not like n > 2^31  !!! */
             char *q = memchr(str_arg, '\0',
                 precision <= (size_t)0x7fffffffL ? precision
                 : (size_t)0x7fffffffL);
-#endif
             str_arg_l = (q == NULL) ? precision
                         : (size_t)(q - str_arg);
           }