[issue16316] Support xz compression in mimetypes module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Xz-related mimetypes was added because Python 3.3+ supports xz compression. Backporting them to 3.3 makes sense. But backporting to 2.7 is more questionable.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16316>
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