Fix macos memory leaks

[madsmtm]

Fixes #2722 without having to do the objc2 update.

• Tested on all platforms changed
• Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality
• Updated feature matrix, if new features were added or implemented

[lunixbochs]

This crashes for me with the examples/window.rs example, if you drop the window:

Crashes every few runs (dropping one window):

#![allow(clippy::single_match)]

use simple_logger::SimpleLogger;
use winit::{
    event::{Event, WindowEvent},
    event_loop::EventLoop,
    window::WindowBuilder,
};

fn main() {
    SimpleLogger::new().init().unwrap();
    let event_loop = EventLoop::new();

    let mut window: Option<winit::window::Window> = None;
    window.replace(WindowBuilder::new()
        .with_title("A fantastic window!")
        .with_inner_size(winit::dpi::LogicalSize::new(128.0, 128.0))
        .build(&event_loop)
        .unwrap());

    event_loop.run(move |event, window_target, control_flow| {
        let event_loop = window_target;
        control_flow.set_wait();
        println!("{event:?}");

        match event {
            Event::MainEventsCleared => {
                window.take();
            }
            _ => (),
        }
    });
}

Crashes every run (repeatedly opening and closing a window):

#![allow(clippy::single_match)]

use simple_logger::SimpleLogger;
use winit::{
    event::{Event, WindowEvent},
    event_loop::EventLoop,
    window::WindowBuilder,
};

fn main() {
    SimpleLogger::new().init().unwrap();
    let event_loop = EventLoop::new();

    let mut window: Option<winit::window::Window> = None;

    event_loop.run(move |event, window_target, control_flow| {
        let event_loop = window_target;
        control_flow.set_wait();
        println!("{event:?}");

        match event {
            Event::MainEventsCleared => {
                window.replace(WindowBuilder::new()
                    .with_title("A fantastic window!")
                    .with_inner_size(winit::dpi::LogicalSize::new(128.0, 128.0))
                    .build(&event_loop)
                    .unwrap());
            }
            _ => (),
        }
    });
}

[madsmtm]

Yeah, I investigated it and found out that this approach cannot be used (the Box that DeallocHelper internally uses is deallocated at the wrong time), so we'll have to do something else instead.

[madsmtm]

Replaced by #2739