Make single thread bench cheat-resistant

Each hash is dependent on the previous hash to make multi-threaded cheating impossible.

src/backend/cuda/CudaBackend.cpp

@@ -481,7 +481,7 @@ void xmrig::CudaBackend::start(IWorker *worker, bool ready)
     mutex.unlock();
 
     if (ready) {
-        worker->start();
+        worker->start(d_ptr->controller->config());
     }
 }
 

src/backend/cuda/CudaWorker.cpp

@@ -145,7 +145,7 @@ size_t xmrig::CudaWorker::intensity() const
 }
 
 
-void xmrig::CudaWorker::start()
+void xmrig::CudaWorker::start(xmrig::Config*)
 {
     while (Nonce::sequence(Nonce::CUDA) > 0) {
         if (!isReady()) {

src/backend/cuda/CudaWorker.h

@@ -39,6 +39,7 @@ namespace xmrig {
 
 
 class ICudaRunner;
+class Config;
 
 
 class CudaWorker : public Worker
@@ -58,7 +59,7 @@ public:
 protected:
     bool selfTest() override;
     size_t intensity() const override;
-    void start() override;
+    void start(Config*) override;
 
 private:
     bool consumeJob();