Fixed behavior if missing library cudnn.lib

AlexeyAB

2017-01-16 d7a30ada7e82daf7ce5ca91acac15c1723188fc5

 src/rnn_layer.h

@@ -5,6 +5,7 @@
#include "activations.h"
#include "layer.h"
#include "network.h"
#define USET

layer make_rnn_layer(int batch, int inputs, int hidden, int outputs, int steps, ACTIVATION activation, int batch_normalize, int log);