message: fix build error of kernel on Mali
diff: @@ -83,7 +83,7 @@ __kernel void TEMPLATE(lrn_full_no_scale,Dtype)(const int nthreads, __global con
  * in_off[(head - size) * step];
  }
  scale_val = k + accum_scale * alpha_over_size;
  - out_off[(head - post_pad) * step] = in_off[(head - post_pad) * step] * (Dtype)native_powr((Dtype)scale_val, (Dtype)negative_beta);
  + out_off[(head - post_pad) * step] = in_off[(head - post_pad) * step] * (Dtype)native_powr(scale_val, negative_beta);
  ++head;
  }
  // subtract only
  @@ -93,7 +93,7 @@ __kernel void TEMPLATE(lrn_full_no_scale,Dtype)(const int nthreads, __global con
  * in_off[(head - size) * step];
  }
  scale_val = k + accum_scale * alpha_over_size;
  - out_off[(head - post_pad) * step] = in_off[(head - post_pad) * step] * (Dtype)native_powr((Dtype)scale_val, (Dtype)negative_beta);
  + out_off[(head - post_pad) * step] = in_off[(head - post_pad) * step] * (Dtype)native_powr(scale_val, negative_beta);
  ++head;
  }
  }
  