[7/7] avifile: use chunksize specified by the chunk itself, avoids a noticable ticking sound heard when reading past the chunk boundry

[Julius Schwartzenberg]

This patch is also independent from the others. It solves a ticking 
sound which was heard because the original code would just play right 
through the chunk and also try to play back parts of the next chunk 
header. This happened when the buffer size was larger then than the data 
that was left in the current chunk. This ticking was also heard in 
Civilization II (with the other patches applied). This patch solves it 
by using the chunk size specified in the chunk's own header and now 
playing past that size.
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