[issue16314] Support xz compression in distutils

[Ned Deily]

Ned Deily added the comment:

The test for lzma being importable is not sufficient.

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ERROR: test_make_archive_xztar (distutils.tests.test_archive_util.ArchiveUtilTestCase)
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Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/tarfile.py", line 389, in __init__
    import lzma
  File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/lzma.py", line 26, in <module>
    from _lzma import *
ImportError: No module named '_lzma'

http://buildbot.python.org/all/builders/AMD64%20Snow%20Leop%203.x/builds/3171/steps/test/logs/stdio

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nosy: +ned.deily

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