Makefile added hints to compile for Jetson Tx1 and Tx2

AlexeyAB

2018-02-07 f03d486760da03c690f069b23e72fc33bd76f3ea

 src/network_kernels.cu

@@ -114,6 +114,7 @@
    state.truth = *net.truth_gpu;
    state.train = 1;
    forward_network_gpu(net, state);
   cudaStreamSynchronize(get_cuda_stream());
    backward_network_gpu(net, state);
}