[m-rev.] diff: stop using io.output_stream in more modules

[Zoltan Somogyi]

This does not need review.

Zoltan.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Log.nis3
Type: application/octet-stream
Size: 336 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20230913/37ba312f/attachment-0002.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DIFF.nis3
Type: application/octet-stream
Size: 17249 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20230913/37ba312f/attachment-0003.obj>