winecoreaudio: Fix AudioRenderClient Get/ReleaseBuffer protocol (resend)

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

[unmodified & sent alone. There's no apply failure in testbot.]

With this patch, MacOS will be the first to correctly implement
the allowed ordering of Get and ReleaseBuffer according to my
rendering tests (see bug #27937).

[...capture mode]
>I believe that ReleaseBuffer(0) always returns S_OK, like in the render case.
Verified indeed. But I've not finalized capture code yet
 (I'm not familiar with capture, so it takes more time).

Because my patch changes the type of getbuf_last, I had to
slightly modify AudioCaptureClient already:
-    This->getbuf_last = TRUE;
+    This->getbuf_last = 1;

This will become "getbuf_last=*frames" once I finalize the correct
ordering for capture mode (the frames==0 case is handled a few lines above that).

Regards,
        Jörg Höhle
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