Restore CN-GPU

src/backend/opencl/OclConfig_gen.h

@@ -63,6 +63,10 @@ size_t inline generate<Algorithm::CN>(Threads<OclThreads> &threads, const std::v
         count++;
     }
 
+#   ifdef XMRIG_ALGO_CN_GPU
+    count += generate("cn/gpu", threads, Algorithm::CN_GPU, devices);
+#   endif
+
     return count;
 }