Zstandard support for setup

[Achim Gratz]

Achim Gratz writes:
>> + using namespace std;
>>
>> Please don't
>
> That's a copy from the compress_xz files and it's used in many files
> elsewhere.  Care to explain why you'd want it removed?  If there's a
> good reason I'd tend to move this to a clean-up commit that touches all
> those files.  We should do that before hauling Zstdandard in.

What an unholy mess… Here's that patch, only lightly tested:
http://repo.or.cz/cygwin-setup/local.git/patch/e9802f50304f66984f6aad5544def465e9f8033b


Regards,
Achim.
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