$(Qt_STDCPP_) is no longer defined

To clarify: 3.3.1 (rev 39) (not accepted in affects version dropdown as it is a beta???)

I believe this macro may have been defined in earlier versions of Qt VS tools.

It seems to no longer be defined.

I had hundreds of projects where C++ Language standard was defined by using this macro which had the value stdcpp17.

I was in the fortunate position of having a property sheet included by every single project so I could workaround this by adding an identically named macro to my own property sheet which then meant I was able to build using the newer VS tools without having to modify hundreds of project files. Others will likely not be so fortunate.

The omission of this macro will likely break the build for others so I would suggest its re-instatement.

See my comment in QTVSADDINBUG-1283 Does not work moc after update to 3.3.1.1