[issue5689] Support xz compression in tarfile module

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset b86b54fcb5c2 by Lars Gustäbel in branch 'default':
Issue #5689: Avoid excessive memory usage by using the default lzma preset.
http://hg.python.org/cpython/rev/b86b54fcb5c2

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