[lopatnov]

Fixes #1119.

pingora-core does not compile for 32-bit Windows. listeners::l4::from_raw_fd passes fd as u64 to TcpStream::from_raw_socket, but std::os::windows::io::RawSocket is u32 when target_pointer_width = "32" and u64 when it is "64":

error[E0308]: mismatched types
   --> pingora-core\src\listeners\l4.rs:240:85
    |
240 |             let std_listener_socket = unsafe { std::net::TcpStream::from_raw_socket(fd as u64) };
    |                                                ------------------------------------ ^^^^^^^^^ expected `u32`, found `u64`

Change

Cast to the RawSocket alias instead of the concrete type (and import it). One line plus the use.

• 64-bit Windows: RawSocket is u64, so fd as RawSocket is exactly the previous fd as u64. No behavior change.
• 32-bit Windows: RawSocket is u32, so it compiles. The fd: i32 to socket conversion is otherwise untouched.
• Every other platform: the line is under #[cfg(windows)], so it is not compiled.

Testing

On main (3f87e92), Windows 11, rustc 1.99.0:

	cargo check -p pingora-core --target i686-pc-windows-msvc	cargo check -p pingora-core (x86_64-pc-windows-msvc)
before	fails: the error above, the only one	passes
after	passes	passes

• cargo fmt -p pingora-core -- --check is clean (the first version of the line was reformatted by rustfmt, as it is now).
• cargo clippy -p pingora-core, for both targets, reports nothing at the changed lines.
• Beyond the crate: a reverse proxy built on pingora-core 0.9.1 with this one-line change (Conduit) builds for i686-pc-windows-msvc with four feature sets and its test suite passes on that target (32-bit executables on a 64-bit Windows runner).
• No test is added: the change only matters on a target the project's CI does not build (it runs Linux only), and a unit test of a type alias would not exercise it. If you would like a 32-bit Windows cargo check job for pingora-core in CI, I can add one in a follow-up.

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