Added preview boxes for SO/DLL usage

AlexeyAB

2018-01-24 cc6ab9b3ccf48322b97f7fe096381d5594d198f7

 src/detection_layer.c

@@ -58,7 +58,7 @@
            int index = b*l.inputs;
            for (i = 0; i < locations; ++i) {
                int offset = i*l.classes;
                softmax_array(l.output + index + offset, l.classes, 1,
                softmax(l.output + index + offset, l.classes, 1,
                        l.output + index + offset);
            }
        }