* minor speedup for put_pixels_x2 & cleanup

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  as its functionality is used even in those parts which are being
  compiled without this flag
  - generaly this would require more complicated cleanup patch
  - for now leaving for the main author

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* fixed busy loop test bug on mmx-only machine

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  (though I'm not sure which one is correct - but they should match)

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  (how about making all headers in ffmpeg working this way ?)

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  requests. The current state is that at startup, WMP will get the
  best stream that it can handle. However, subsequent rate switching
  only puts a message in the log saying what the new stream ought to
  be. Solving this will be tricky. I guess that we would have to wait for
  key frames to appear in the new stream, and then switch over to it.
  Some care would be needed to deal with the PTS of the new stream
  versus the old stream.

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a higher priority than extensions. This gives FFM a chance of working. Note
that some of the other probe functions are bit optimistic, and can be
confused by binary data (such as 0x00 0x00 0x01 0xzz) for some values of zz.

This set of changes makes ffserver work again, and fixes the cannot open
video grab device message.

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