hotpatching_systems.rs hotpatching fails with cannot find ‘ld’

## Version Info

Bevy: 0.17.2
Rust: 1.90.0 (840b83a10 2025-07-30)
OS: Ubuntu 24.02
dioxus-cli: rc.0

## What you did

I tried out the `hotpatching_system.rs` demo with:

```
dx serve --hot-patch --example hotpatching_systems --features hotpatching
```

and attempted to change "before" to "after"

## What went wrong

bevy fails to hot-patch giving:
```
16:13:42 [dev] Failed to generate patch: collect2: fatal error: cannot find ‘ld’
compilation terminated.
16:13:42 [dev] Build failed: No such file or directory (os error 2)
```

Start with the hotpatching_system.rs example and reproduce the failure using `dx serve --hot-patch --example hotpatching_systems --features hotpatching` on Ubuntu. Trace the hotpatch patch-generation build step that reports the missing `ld`; done means the patch is generated successfully and changing “before” to “after” works.

Written by the indexing model from the issue text.