progress not updated when building supply depots

[mboedigh]

The SCV with orders to build a supply depot will go about building the depot through completion, but the orders list will show the progress as zero the whole time.
The code below is a snippet of the code illustrating the problem: with const *iUnit pointing to the SCV that is doing the building

  if (iUnit != NULL)
        {
            if (!iUnit->orders.empty())
            {
                auto &o = *iUnit->orders.begin();
                std::cout << "\nprogress on " << AbilityTypeToName(o.ability_id) << " " << o.progress;
            }
        }

[alkurbatov]

I also have problems with it. Currently the only way to monitor build progress is to track the structure scv is building by tag. However here we encounter #32