eframe: Add winuser feature to winapi to fix unresolved import

[varphone]

After merging PR #4036, build errors occurred in eframe-related applications:

error[E0432]: unresolved import `winapi::um::winuser`
   --> crates\eframe\src\native\app_icon.rs:83:9
    |
83  |     use winapi::um::winuser;
    |         ^^^^^^^^^^^^^^^^^^^ no `winuser` in `um`
    |
note: found an item that was configured out
   --> C:\Users\Varphone\.cargo\registry\src\index.crates.io-6f17d22bba15001f\winapi-0.3.9\src\um\mod.rs:290:37
    |
290 | #[cfg(feature = "winuser")] pub mod winuser;
    |                                     ^^^^^^^
    = note: the item is gated behind the `winuser` feature

For more information about this error, try `rustc --explain E0432`.
error: could not compile `eframe` (lib) due to previous error
warning: build failed, waiting for other jobs to finish...

[emilk]

Thanks!

Next time the CI will catch this: #4038

[quietvoid]

Any chance for a bugfix release?
I'm not exactly sure if this is fixable in my app without having to jump to using git for version.

Nevermind, I guess I just shouldn't update Cargo.lock..

[emilk]

A workaround is to just add this is to your own Cargo.toml:

[target.'cfg(any(target_os = "windows"))'.dependencies]
winapi = { version = "0.3.9", features = ["winuser"] }

[oscargus]

Just for reference, this happens independently of #4036. I'm still on egui 0.25 and was bitten by this. My best guess is that arboard had this feature pinned in 3.2.1, but when updated to 3.3.1 (which should have been a non-breaking change), the dependency on winapi was removed and therefore the feature was removed.