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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 10cca530d14c by Zachary Ware in branch '3.4':
Issue #21745: Mention VS2010 SP1 as a solution for LNK1123 errors
http://hg.python.org/cpython/rev/10cca530d14c

New changeset b5b54073d495 by Zachary Ware in branch 'default':
Issue #21745: Merge with 3.4
http://hg.python.org/cpython/rev/b5b54073d495

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