Fixed ability for support OpenCV for yolo_cpp_dll_no_gpu.sln

AlexeyAB

2018-06-23 99c92f98e08c007b23b21d2e0887a59f14045efb

 build/darknet/x64/yolo-voc.cfg

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