[issue6715] xz compressor support

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> This module is only useful in the standard library if it is available
> on all systems.

Not really. xz is becoming a defacto standard under Linux (and perhaps
other free Unices) while I guess it is marginal under Windows. 
We have other system-specific functionality, and nobody sees it as a bad
thing.

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