[PD] Pd-GUI-Rewrite test builds

[colet.patrice at free.fr]

Selon Hans-Christoph Steiner <hans at at.or.at>:


> Cygwin is not _WIN32, by the way.  It is a POSIX-style API much closer
> to GNU/Linux than Win32.  MinGW is _WIN32 with as much POSIX/UNIX
> thrown in as possible.
>

 the compiler define both _WIN32 and UNIX preprocessor, so it's troubling...

maybe the solution is here?

http://www.cygwin.com/ml/cygwin/2002-11/msg00522.html