wallet: Make WalletInitInterface and DummyWalletInit private

src/init.cpp

@@ -72,7 +72,24 @@ static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 std::unique_ptr<CConnman> g_connman;
 std::unique_ptr<PeerLogicValidation> peerLogic;
-std::unique_ptr<WalletInitInterface> g_wallet_init_interface;
+
+#if !(ENABLE_WALLET)
+class DummyWalletInit : public WalletInitInterface {
+public:
+
+    std::string GetHelpString(bool showDebug) override {return std::string{};}
+    bool ParameterInteraction() override {return true;}
+    void RegisterRPC(CRPCTable &) override {}
+    bool Verify() override {return true;}
+    bool Open() override {return true;}
+    void Start(CScheduler& scheduler) override {}
+    void Flush() override {}
+    void Stop() override {}
+    void Close() override {}
+};
+
+std::unique_ptr<WalletInitInterface> g_wallet_init_interface(new DummyWalletInit);
+#endif
 
 #if ENABLE_ZMQ
 static CZMQNotificationInterface* pzmqNotificationInterface = nullptr;