Port of OpenBSD's sdiff

[Doug Barton]

Steven Kreuzer wrote:
> Greetings-
> 
> OpenBSD includes a version of sdiff released to the public domain.
> In a quest to remove as much GPL code from FreeBSD as possible, I
> ported it over.

That's a worthy goal! :) One request, there is an sdiff option in
mergemaster that I hope you would regression test to make sure that at
least that level of functionality is available in the new version.

Thanks,

Doug

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