[AVIFIL32] Fix wrong logic in acmstream.c and icmstream.c

[Paul Vriens]

Hi, 

the functions [ACM|ICM]Stream_fnRelease have the wrong logic regarding
decrementing the reference count.

The fix also includes the change to use Interlocked* as it's a bit
strange to move the non thread-safe This->refs around and fix them in a
second patch.

If this is preferred I will separate the changes.

The fact that the logic is wrong was acknowledged by Michael Günnewig.

Changelog
- fix logic in Stream_fnRelease, refcount should be decremented before
the test for 0.
- use Interlocked* functions in Stream_fnRelease .
- store the result of the Interlocked functions and this in the TRACE.

Cheers,

Paul Vriens.
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