Added basic cn/gpu support.

src/backend/opencl/kernels/Cn0Kernel.h

@@ -35,7 +35,8 @@ namespace xmrig {
 class Cn0Kernel : public OclKernel
 {
 public:
-    Cn0Kernel(cl_program program);
+    inline Cn0Kernel(cl_program program) : OclKernel(program, "cn0") {}
+
     bool enqueue(cl_command_queue queue, uint32_t nonce, size_t threads);
     bool setArgs(cl_mem input, cl_mem scratchpads, cl_mem states, uint32_t threads);
 };