... it's just better than markdown.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Mirrors changes in 89900c0 ("examples/rust: Remove some redundant unsafe
blocks")

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

... as noted by the compiler...

Fixes: 2cf492f ("examples/rust: Fix some new rustc warnings")
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Update wasi-sdk & libclang_rt.builtins-wasm32-wasi to 25.0

Note: The layout of the libclang_rt.builtins-wasm32-wasi archive has
changed slightly.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

When building the rust stuff we were getting the following compiler
error

  error: failed to run `rustc` to learn about target-specific information

  ...

    --- stderr
    error: Error loading target specification: Could not find specification for target "wasm32-wasi". Run `rustc --print target-list` for a list of built-in targets

This is due to wasm32-wasi being renamed to wasm32-wasip1, with
wasm32-wasi being kept clear for an eventual WASI 1.0 release.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

With at least

  rustc 1.79.0 (129f3b996 2024-06-10) (Fedora 1.79.0-3.fc40)

We were getting warnings when building the rust examples like

warning: creating a mutable reference to mutable static is discouraged
  --> src/lib.rs:75:40
   |
75 |     let ctx: *mut luw_ctx_t = unsafe { &mut CTX };
   |                                        ^^^^^^^^ mutable reference to mutable static
   |
   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
   = note: this will be a hard error in the 2024 edition
   = note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
   = note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
   |
75 |     let ctx: *mut luw_ctx_t = unsafe { addr_of_mut!(CTX) };
   |                                        ~~~~~~~~~~~~~~~~~

So do like it says and use the addr_of_mut!() macro.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>