Add a Windows version of foreign2.rs

Author: saethlin

tests/ui/foreign/foreign2.rs

@@ -1,9 +1,8 @@
 //@ run-pass
-#![allow(dead_code)]
 //@ pretty-expanded FIXME #23616
-#![feature(rustc_private)]
 
-extern crate libc;
+#![allow(dead_code)]
+#![feature(rustc_private)]
 
 mod bar {
     extern "C" {}
@@ -13,14 +12,37 @@ mod zed {
     extern "C" {}
 }
 
+#[cfg(not(windows))]
 mod mlibc {
+    extern crate libc;
     use libc::{c_int, c_void, size_t, ssize_t};
 
     extern "C" {
         pub fn write(fd: c_int, buf: *const c_void, count: size_t) -> ssize_t;
     }
 }
 
+#[cfg(windows)]
+mod mlibc {
+    #![allow(non_snake_case)]
+
+    use std::ffi::c_void;
+
+    pub type BOOL = i32;
+    pub type HANDLE = *mut c_void;
+
+    #[link(name = "ntdll")]
+    extern "system" {
+        pub fn WriteFile(
+            hfile: HANDLE,
+            lpbuffer: *const u8,
+            nnumberofbytestowrite: u32,
+            lpnumberofbyteswritten: *mut u32,
+            lpoverlapped: *mut c_void,
+        ) -> BOOL;
+    }
+}
+
 mod baz {
     extern "C" {}
 }