fix a long-standing DXR3 DVD problem: forced subtitles were not handled correctly

When forced subtitles are enabled, only those subtitles of a subtitle stream
with a special flag set should be displayed. The designers of the SPU format
decided to be funny and placed this flag near the end of a SPU. With the DXR3,
it can therefore happen that you already wrote half the SPU to the card,
because it spans across multiple buffers, when you finally notice that you are
not supposed to show this one at all. For that reason, the DXR3 had used a
different filtering, which worked most of the time, but was, in the end, wrong.
Now I found a way to invalidate a SPU after it had already been partly written
to the card, so we can do things the right way.
This finally fixes missing subtitles with "The Lord of the Rings - The Two Towers".

CVS patchset: 7021
CVS date: 2004/10/08 20:39:51

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