Allow compiling with vs2022

[xhochy]

The background is the solving failure I see in conda-forge/librsvg-feedstock#110 where vs2022 is requested as a compiler. This would make the activation package more "open" but also would pull in vs2022 probably as default?

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[h-vetinari]

LGTM

[h-vetinari]

This would make the activation package more "open" but also would pull in vs2022 probably as default?

AFAIU it'll pull in vs2022 if there's only {{ compiler("rust") }}; as soon as there's {{ compiler("c|cxx") }} in the build env that resolves to vs2019, it would resolve to that instead.