Fix dlls/cryptnet/cryptnet_main.c on FreeBSD

[Gerald Pfeifer]

On Thu, 18 Sep 2008, Gerald Pfeifer wrote:
> The following change to dlls/cryptnet/cryptnet_main.c broke FreeBSD:
> 
>   cryptnet: Define CERT_REVOCATION_PARA_HAS_EXTRA_FIELDS before including 
>   any PSDK headers.
> 
> By means of the removal of #include <stdio.h> we no longer define va_list
> which is, however, used by ../../include/winbase.h.  The patch below fixes
> this by including stdarg.h.

Sorry, forget about the stdio.h part of the description.  It is wrong.
The typedef presumably came via #include "wine/debug.h"...

Gerald