问题情况

[x] ProcessPrng（Windows Vista RTM缺失）
[x] rust raw-dylib引用规则适配（#78）

复现代码(#60)

use tokio::net::TcpListener;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let listener = TcpListener::bind("127.0.0.1:8080").await?;// 这里报错PermissionDined
    loop {
        let (mut socket, _) = listener.accept().await?;
        tokio::spawn(async move {
            let mut buf = [0; 1024];
            loop {
                let n = match socket.read(&mut buf).await {
                    // socket closed
                    Ok(n) if n == 0 => return,
                    Ok(n) => n,
                    Err(e) => {
                        eprintln!("failed to read from socket; err = {:?}", e);
                        return;
                    }
                };
                if let Err(e) = socket.write_all(&buf[0..n]).await {
                    eprintln!("failed to write to socket; err = {:?}", e);
                    return;
                }
            }
        });
    }
}

首先vstudio 2017 https://visualstudio.microsoft.com/zh-hans/vs/older-downloads/ ,安装的时候要勾选windows_xp_build 选项
安装rust编译器 https://www.rust-lang.org/
按照readme的步骤，安装thunk编译工具, 地址是 https://github.com/felixmaker/thunk
切换工具链指令
```
rustup default  nightly
```
更新到最新的每夜版
```
rustup update
```
执行上面的编译tokio代码
```
thunk --os xp --arch x86 -- --release
```
拷贝target/winxp_build/i686-pc-windows-msvc/release/xxxx.exe到winserver 2008/vista虚拟机