[issue6715] xz compressor support

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

Patch update time! Noteworthy changes:
* Windows build support, thanks to Amaury
* Thread safety for LZMACompressor and LZMADecompressor, by means of per-instance locks
* O(n) buffer growth strategy

I've tried running the tests on Windows, but I've been getting failures
that don't look like they're related to the new code. I think they are
due to issue 7443. I'll try and tweak my Windows setup a bit over the
weekend to see if I can get things working smoothly.

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