message: build: fix MSVS2010 build error
diff: @@ -308,7 +308,7 @@ public:
  aspectRatios.copyTo(umat_aspectRatios);
  variance.copyTo(umat_variance);
  - int real_numPriors = _numPriors / pow(2, _offsetsX.size() - 1);
  + int real_numPriors = _numPriors >> (_offsetsX.size() - 1);
  umat_scales = UMat(1, &real_numPriors, CV_32F, 1.0f);
  }
  @@ -383,7 +383,7 @@ public:
  CV_Assert(inputs.size() == 2);
  - size_t real_numPriors = _numPriors / pow(2, _offsetsX.size() - 1);
  + size_t real_numPriors = _numPriors >> (_offsetsX.size() - 1);
  if (_scales.empty())
  _scales.resize(real_numPriors, 1.0f);
  else
  