CustomCursor Does Not Work On Linux

## Bevy version

v0.15.3

## Relevant system information

```
AdapterInfo { name: "AMD Radeon RX 7600 XT (RADV NAVI33)", vendor: 4098, device: 29824, device_type: DiscreteGpu, driver: "radv", driver_info: "Mesa 24.2.8", backend: Vulkan }
```

## What you did

I need a custom cursor for the game I'm working on. I inserted a `CursorIcon` component with a png:

```rust
const CURSOR_SIZE: u16 = 16;

fn setup_cursor_system(
mut commands: Commands,
mut window_created_events: EventReader,
asset_server: Res,
) {
for WindowCreated { window } in window_created_events.read() {
if let Some(mut window_commands) = commands.get_entity(*window) {
let cursor_texture = asset_server.load("sprites/gui/crosshair.png");

window_commands.insert(CursorIcon::Custom(CustomCursor::Image {
handle: cursor_texture,
hotspot: (CURSOR_SIZE / 2, CURSOR_SIZE / 2),
}));

debug!("Set custom game cursor");
} else {
error!("Failed to lookup window entity for setting game cursor");
}
}
}
```

## What went wrong

On Windows, the cursor does in fact render how I'd expect, but both X11 and Wayland do not render the custom cursor on Linux. Instead, only the default OS cursor is shown.

## Additional information

The work around I'm experimenting with right now is just creating a sprite and moving it to where the cursor is, but this doesn't work well with egui. The problem is that I don't know how to render the sprite in front of the gui. It would be much more ideal for the cursor to be rendered by the OS.