run the equivalent of vcvarsall.bat when using 'Visual C++ for Python 2.7'
This means that any command prompt will properly build everything, whereas before the 'Visual C++ 2008 64-bit Cross Tools Command Prompt' was required. The goal is to remove a point of failure (the plain 64-bit prompt fails), and to move towards automated builds like core Mercurial. I've only got the Express edition at home (which fails to build this), so I'm not doing the same for Visual Studio 2008.
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