Update WASI to cap-std 0.25 and windows-sys. (#4302)

This updates to rustix 0.35.6, and updates wasi-common to use cap-std 0.25 and
windows-sys (instead of winapi).

Changes include:

 - Better error code mappings on Windows.
 - Fixes undefined references to `utimensat` on Darwin.
 - Fixes undefined references to `preadv64` and `pwritev64` on Android.
 - Updates to io-lifetimes 0.7, which matches the io_safety API in Rust.
 - y2038 bug fixes for 32-bit platforms

tests/all/custom_signal_handler.rs

@@ -4,7 +4,7 @@
 ))]
 mod tests {
     use anyhow::Result;
-    use rustix::io::{mprotect, MprotectFlags};
+    use rustix::mm::{mprotect, MprotectFlags};
     use std::sync::atomic::{AtomicBool, Ordering};
     use std::sync::Arc;
     use wasmtime::unix::StoreExt;