Corrade VS2019 support

[hsdk123]

Magnum doesn't configure on CMake properly for VS2019 with error:

To use Corrade with MSVC 2019, build it with MSVC2019_COMPATIBILITY enabled

Even if I do define MSVC2019_COMPATIBILITY, configure doesn't work.
If I define CORRADE_MSVC2019_COMPATIBILITY, configure works.

[mosra]

Hi!

This is most probably due to an outdated FindCorrade.cmake. Assuming this happens while configuring your own project (and not while building Magnum itself, there it seems to be okay), can you put a fresh copy of FindCorrade.cmake into your project's module directory and try again?

I'm aware that this problem happens with projects from the magnum-bootstrap repository, still need to update that one (sorry about that if that's the case).

[hsdk123]

Hey! Yup, I was building from the magnum-bootstrap repo. Seems to work well with the new FindCorrade.cmake.

I was also just in the process of evaluating whether to shift my team to using Magnum. It's great to see such fast responses!

[mosra]

As of mosra/magnum-bootstrap@0b384ce (and related changes in other repos), the magnum-bootstrap repo is finally updated for MSVC 2019 compatibility.