Enable clippy::ref_as_ptr

[BD103]

Objective

• clippy::ref_as_ptr prevents you from directly casting references to pointers, requiring you to use std::ptr::from_ref instead. This prevents you from accidentally converting an immutable reference into a mutable pointer (&x as *mut T).
• Follow up to Replace pointer castings (as) by their API equivalent #11818, now that our rust-version is 1.77.

Solution

• Enable lint and fix all warnings.

[BD103]

@tguichaoua, would you mind reviewing?

[BD103]

I'm honestly unsure why CI is failing. It's definitely running Rust 1.77.2. I'm probably going to just fix the lint instead of digging into this further.

error: unknown lint: `clippy::ref_as_ptr`
 --> crates/bevy_mikktspace/src/lib.rs:6:5
  |
6 |     clippy::ref_as_ptr
  |     ^^^^^^^^^^^^^^^^^^ help: did you mean: `clippy::ptr_as_ptr`
  |
  = note: `-D unknown-lints` implied by `-D warnings`
  = help: to override `-D warnings` add `#[allow(unknown_lints)]`

[Brezak]

This will need to be reverted. ref_as_ptr isn't in stable yet.
Disregard this. The warnings don't trigger CI failure.

[BD103]

This will need to be reverted. ref_as_ptr isn't in stable yet.

Well that explains why I was getting this error earlier. I'm surprised CI doesn't complain about it in Cargo.toml, but does when used in #[allow(...)].

Unless it's giving someone issues locally, I think this can probably be kept.