[issue6715] xz compressor support

[Amaury Forgeot d'Arc]

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

*Very* good news for lzma on windows: The precompiled static library liblzma.a works very well with MSVC (tested with VS2008 on Windows XP, 32bit).  This was a surprise for me...

Here is a patch for the win32 build files, to be applied after Nadeem's.
I did not update the svn "external" repository, for my local copy I simply extracted xz-5.0.3-windows.zip.
Tests pass in release and debug builds, and depends.exe shows no special requirements for _lzma.pyd.  I could not test win64.

Nadeem, in test.support precisionbigmemtest was recently renamed to bigmemtest, could you update your patch?

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Added file: http://bugs.python.org/file23371/lzma-win32.diff

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