Spurious use of `Sleep`?

[msprotz]

obj/crypto/hashing/testsha256.c:34:3: warning: implicit declaration of function 'Sleep' [-Wimplicit-function-declaration]
   Sleep(200);  // Sleep for 200ms

On Linux:

NAME
       sleep - sleep for a specified number of seconds

SYNOPSIS
       #include <unistd.h>

Worth an #ifdef?

[BarryBo]

The containing function is actually dead code. Easier fix is to delete it.