msacm32/tests: Add some acmStreamPrepareHeader and acmStreamConvert tests (try 2)

[Andrew Eikum]

On Tue, Nov 24, 2015 at 12:48:50PM -0600, Andrew Eikum wrote:
> On Tue, Nov 24, 2015 at 05:08:00PM +0800, Bruno Jesus wrote:
> > +    hdr.cbSrcLengthUsed = 12345;
> > +    hdr.cbDstLengthUsed = 12345;
> 
> The rest looks OK, but I don't understand why these are set. Does the
> application really set them to this value after Prepare and before
> Convert? The tests seem to behave the same if I leave them at 0.
> 

Oh, I see, the rest of the tests do that, too. Probably to demonstrate
that Convert changes the value. OK.

Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>