Auto merge of #75971 - Amjad50:libstd-deny-unsafe_op_in_unsafe_fn, r=Mark-Simulacrum

Applied `#![deny(unsafe_op_in_unsafe_fn)]` in library/std/src/wasi

partial fix for #73904

There are still more that was not applied in [mod.rs]( https://github.com/rust-lang/rust/blob/38fab2ea92a48980219989817201bf2094ae826a/library/std/src/sys/wasi/mod.rs) and that is due to its using files from `../unsupported`

like:
```
#[path = "../unsupported/cmath.rs"]
pub mod cmath;
```

diff --cc library/std/src/sys/wasi/ext/fs.rs
Simple merge