AVIFIL32: fix gcc 4.0 warnings

[Mike McCormack]

acmstream.c: In function 'ACMStream_fnFindSample':
acmstream.c:307: warning: pointer targets in passing argument 3 of 
'acmStreamSize' differ in signedness
acmstream.c:315: warning: pointer targets in passing argument 3 of 
'acmStreamSize' differ in signedness
...

ChangeLog:
fix gcc 4.0 warnings
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