Fix sem_getvalue

[Paul Kunysch]

> That looks like a reasonable fix.  Did you trace through all of the
> callers of semaphore::_getvalue to make sure that some of them aren't
> relying on the old behavior?

I did not look for other callers.

I just wrote a very simple test for sem_getvalue() and copied different 
cygwin1.dll versions to my test-application.
-- 

Kunysch, Paul
Software Development

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