For discussion! Enable compilation using Visual C++ 2002 & 2003
For discussion! Enable compilation using Visual C++ 2002 & 2003

This bizarre patch results in a full test-suite pass for Visual Studio
.NET 2002 & 2003. Without it, the following code segfaults (resulting in
6 failing tests):

```ocaml
  #load "unix.cma";;
  let (ifd, _) = Unix.pipe ();;
  Unix.in_channel_of_descr ifd;;
```

gerdstolpmann/ocaml,msprotz/ocaml,eliberis/ocaml,yunxing/ocaml,msprotz/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,msprotz/ocaml,eliberis/ocaml,eliberis/ocaml,eliberis/ocaml,yunxing/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,yunxing/ocaml,eliberis/ocaml