message: dnn: do not try to rebuilt network during setInput()
  this doesn't make sense in case of multiple inputs
diff: @@ -1339,6 +1339,11 @@ struct Net::Impl : public detail::NetImplBase
  #endif
  clear();
  + if (hasDynamicShapes)
  + {
  + updateLayersShapes();
  + }
  +
  this->blobsToKeep = blobsToKeep_;
  allocateLayers(blobsToKeep_);
  @@ -3886,13 +3891,8 @@ void Net::setInput(InputArray blob, const String& name, double scalefactor, cons
  bool oldShape = prevShape == blobShape;
  blob_.copyTo(impl->netInputLayer->inputsData[pin.oid]);
  - if (!oldShape) {
  + if (!oldShape)
  ld.outputBlobs[pin.oid] = impl->netInputLayer->inputsData[pin.oid];
  - if (impl->hasDynamicShapes)
  - {
  - impl->updateLayersShapes();
  - }
  - }
  if (!ld.outputBlobsWrappers[pin.oid].empty())
  {
  