Core/Misc: Fix clang 6.0 warnings

Ported from e9bcae1fad

src/common/Cryptography/OpenSSLCrypto.cpp

@@ -33,6 +33,7 @@ static void lockingCallback(int mode, int type, char const* /*file*/, int /*line
 
 static void threadIdCallback(CRYPTO_THREADID * id)
 {
+    (void)id;
     CRYPTO_THREADID_set_numeric(id, std::hash<std::thread::id>()(std::this_thread::get_id()));
 }
 
@@ -41,9 +42,13 @@ void OpenSSLCrypto::threadsSetup()
     cryptoLocks.resize(CRYPTO_num_locks());
     for(int i = 0 ; i < CRYPTO_num_locks(); ++i)
     {
-        cryptoLocks[i] = new std::mutex;
+        cryptoLocks[i] = new std::mutex();
     }
+
+    (void)&threadIdCallback;
     CRYPTO_THREADID_set_callback(threadIdCallback);
+
+    (void)&lockingCallback;
     CRYPTO_set_locking_callback(lockingCallback);
 }