[AVIFILE1] Some bugs ...

[Michael Günnewig]

Changelog:
  - Fixed AVIStreamTimeToSample and AVIStreamSampleToTime methods to
    stay in bounds and behave like the native ones.
  - Fallback to mmioOpenA if mmioOpenW doesn't work (when using Win9x DLLs).
  - Fixed a bug of using mmioDescend/mmioAscend (occured with native libs).
  - Silent a message which could be incorrect for non-video streams.


  Michael Günnewig

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