Update to work with winit 0.29.15

[uglyoldbob]

This pull request updates the winit dependency to 0.29.15 and fixes things that broke.

[notgull]

Please fix the warnings that appear.

warning: unused import: `std::os::raw`
  --> src/platform/x11.rs:29:5
   |
29 | use std::os::raw;
   |     ^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `XVisualID`
  --> src/platform/x11.rs:32:76
   |
32 | use winit::platform::x11::{EventLoopBuilderExtX11 as _, WindowExtX11 as _, XVisualID};
   |                                                                            ^^^^^^^^^

warning: unused import: `WindowExtX11`
  --> src/platform/x11.rs:32:57
   |
32 | use winit::platform::x11::{EventLoopBuilderExtX11 as _, WindowExtX11 as _, XVisualID};
   |                                                         ^^^^^^^^^^^^

warning: unused import: `WindowExtWayland`
  --> src/platform/wayland.rs:32:68
   |
32 |     EventLoopBuilderExtWayland as _, WindowBuilderExtWayland as _, WindowExtWayland as _,
   |                                                                    ^^^^^^^^^^^^^^^^

warning: unused variable: `code`
   --> src/filter.rs:244:21
    |
244 |         if let Some(code) = self.reactor.exit_requested() {
    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: struct `CallOnDrop` is never constructed
   --> src/handler.rs:540:8
    |
540 | struct CallOnDrop<F: FnMut()>(F);
    |        ^^^^^^^^^^
    |
    = note: `#[warn(dead_code)]` on by default

warning: method `pop` is never used
   --> src/sync.rs:557:12
    |
550 |     pub trait ConcurrentQueue<T> {
    |               --------------- method in this trait
...
557 |         fn pop(&self) -> Option<T>;
    |            ^^^

warning: trait `EventLoopPrivate` is never used
   --> src/platform.rs:110:19
    |
110 |         EventLoop EventLoopPrivate
    |                   ^^^^^^^^^^^^^^^^
    |
    = note: this warning originates in the macro `sealed_trait_with_gen` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: `async-winit` (lib) generated 28 warnings (run `cargo fix --lib -p async-winit` to apply 2 suggestions)
warning: unused `Result` that must be used
   --> examples/window.rs:36:5
    |
36  | /     evl.block_on(async move {
37  | |         // Wait for a resume event to start.
38  | |         target.resumed().await;
...   |
102 | |         target.exit().await
103 | |     });
    | |______^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
help: use `let _ = ...` to ignore the resulting value
    |
36  |     let _ = evl.block_on(async move {
    |     +++++++

warning: `async-winit` (example "window") generated 1 warning
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 44.89s
     Running `target/debug/examples/window`

[notgull]

For reference, I was planning on doing the porting work myself once winit stabilized and stopped having these frequent breaking changes. The current plan is that v0.31 should be relatively stable, but I wasn't about to hold my breath.

[uglyoldbob]

Ah that makes sense. I wanted to experiment with making an async version of egui and wanted something compatible with winit 0.29.15 to mess around with.

[uglyoldbob]

I have this ready for review. @notgull

[notgull]

It looks like my CI instance crashed, let me see if I can bring it back up...

[notgull]

Good news! My CI instance is back up. Bad news! Previously I had it on a physical server, but now that's not possible so I've have it hosted now on a AWS EC2 instance with one core. Bummer, and it looks like I've built up a backlog. How big is it?

Oh no!

Well, give me some time here. It might be a while.