[issue6715] xz compressor support

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I just added the missing files liblzma.a to the "externals" repository.
If someone can quickly check that it works on win32, I don't have anything else to add to this change.

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<http://bugs.python.org/issue6715>
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