[issue14673] add sys.implementation

[Richard Oudkerk]

Richard Oudkerk <shibturn at gmail.com> added the comment:

The Windows buildbots were failing compilation.

I've added Object/namespaceobject.c and Include/namespaceobject.h to PCbuild/pythoncore.vcxproj in changeset ee7cd7d51ed6.

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nosy: +sbt

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