Fix MSVC build issues

tests/hasher/siphash.cc

@@ -102,7 +102,7 @@ int siphash(const void *in, const size_t inlen, const void *k, uint8_t *out,
     uint64_t m;
     int i;
     const unsigned char *end = ni + inlen - (inlen % sizeof(uint64_t));
-    const int left = inlen & 7;
+    const int left = (const int)(inlen & 7);
     uint64_t b = ((uint64_t)inlen) << 56;
     v3 ^= k1;
     v2 ^= k0;