Function reduce

app/src/ThirdParty/tweetnacl.c:836–842

}

sv reduce(u8* r)
{
  i64 x[64], i;
  FOR(i, 64) x[i] = (u64)r[i];
  FOR(i, 64) r[i] = 0;
  modL(r, x);
}

int crypto_sign(u8* sm, u64* smlen, const u8* m, u64 n, const u8* sk)
{