Mockup of the new package os interface (incomplete and non-functioning)

core/os/os2/pipe_windows.odin

@@ -0,0 +1,13 @@
+//+private
+package os2
+
+import win32 "core:sys/windows"
+
+_pipe :: proc() -> (r, w: Handle, err: Error) {
+	p: [2]win32.HANDLE;
+	if !win32.CreatePipe(&p[0], &p[1], nil, 0) {
+		return 0, 0, error_from_platform_error(i32(win32.GetLastError()));
+	}
+	return Handle(p[0]), Handle(p[1]), nil;
+}
+