Replace windows-sys dependency with generated bindings

[djc]

This avoids the substantial churn and large downloads from the windows-sys dependency in favor of generating checked in code using the windows-bindgen crate (which ultimately also generates the windows-sys code).

I've used a similar setup successfully in chrono, and it's generally pretty low maintenance.

[fdncred]

Thanks. This looks cool and interesting but harder to maintain. Currently, I'm not a fan of doing it this way.

[djc]

Thanks. This looks cool and interesting but harder to maintain. Currently, I'm not a fan of doing it this way.

It does shift some complexity from your downstream users to the maintainers. Why specifically do you think it's harder to maintain?

[fdncred]

Why specifically do you think it's harder to maintain?

Because, to me, it seems more like a hack around the cargo pkg mgmt system that requires a separate level of knowledge of how this works. Also, I'm not sure how we guarantee MSRV by doing this.

[djc]

Why specifically do you think it's harder to maintain?

Because, to me, it seems more like a hack around the cargo pkg mgmt system that requires a separate level of knowledge of how this works.

All of the knowledge is more or less in the code generation test I posted.

Also, I'm not sure how we guarantee MSRV by doing this.

The normal way? The generated code is checked in so it's subject to your normal CI workflows. windows-bindgen itself is only a dev-dependency so there's no need for it to affect your MSRV.