avifil32: Overwrite dwRate in the audiostream with the nBlockAlign from the wave header

[Julius Schwartzenberg]

I was stupid last week and sent patches in a serie that didn't actually 
depend on each other. I'm resending them properly now. All fixes are 
actually independent from each other.

I started looking into some problems avifil32 had because Civilization 
II would crash if it tried to play it's intro movie.
I created a small program to print information about the different 
headers in AVI files and to play back the audio stream. Also with this 
program, many AVI files failed to play (while they worked on Windows 
with it). The fixes I introduce also allow my testing program to play 
back everything correctly.

These patches solve this problem and several other problems.
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