Some fixes for AVX support on CPU

AlexeyAB

2018-08-13 f92b20580a21663c5db9eb8608f8cabd7adbeb10

 src/layer.h

@@ -179,6 +179,10 @@
    float *weights;
    float *weight_updates;

    char *align_bit_weights;
    float *mean_arr;
    int lda_align;

    float *col_image;
    int   * input_layers;
    int   * input_sizes;