nonblocking waitpid() on win32

I believe that waitpid() has a problem in ActiveState's perl port (I'm
using v5.6.0).  The call accepts a flags argument, but apparently
ignores it and [according to someone who independently verified this]
just calls WaitForSingleObject(hProcess, INFINITE) rather than checking
the flag and allowing a timeout.  

In addition, POSIX::WNOHANG has not been defined but probably should be
(as 1). 

The overall goal, of course, is to be able to do a 

	waitpid($pid,&POSIX::WNOHANG);

and have it work correctly, as it does with non-activestate perl under
Linux...

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Brian Clarke
Applied MetaComputing LLC
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• nonblocking waitpid() on win32 by Brian