sys: use `process::abort()` instead of `arch::wasm32::unreachable()`

Rationale:

  - `abort()` lowers to `wasm32::unreachable()` anyway.
  - `abort()` isn't `unsafe`.
  - `abort()` matches the comment better.
  - `abort()` avoids confusion by future readers (e.g.
    https://github.com/rust-lang/rust/pull/81527): the naming of wasm's
    `unreachable' instruction is a bit unfortunate because it is not
    related to the `unreachable()` intrinsic (intended to trigger UB).

Codegen is likely to be different since `unreachable()` is `inline`
while `abort()` is `cold`. Since it doesn't look like we are expecting
here to trigger this case, the latter seems better anyway.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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