[docs] [issue21745] Devguide: mention requirement to install Visual Studio SP1 on Windows

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9794412fa62d by Zachary Ware in branch 'default':
Issue #21745: Mention VS2010 SP1 as a solution for error LNK1123.
http://hg.python.org/devguide/rev/9794412fa62d

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nosy: +python-dev

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