Makefile added hints to compile for Jetson Tx1 and Tx2

AlexeyAB

2018-02-07 f03d486760da03c690f069b23e72fc33bd76f3ea

 build/darknet/x64/yolo-voc.cfg

@@ -256,3 +256,4 @@
absolute=1
thresh = .6
random=1