remove compile warning for build_id

This is another way to remove compile warning for redis.c

I think many times about this.
```c
redis.c: In function ‘genRedisInfoString’:
redis.c:1966:13: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 6 has type ‘uint64_t’ [-Wformat]
redis.c: In function ‘version’:
redis.c:2506:9: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 7 has type ‘uint64_t’ [-Wformat]

```

but it looks bad.