Fix usleep compilation warning in auth.c (#11925)
There is a -Wimplicit-function-declaration warning in here:
```
auth.c: In function ‘AuthBlock_ThreadMain’:
auth.c:116:5: warning: implicit declaration of function ‘usleep’; did you mean ‘sleep’? [-Wimplicit-function-declaration]
116 | usleep(500000);
| ^~~~~~
| sleep
```
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