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Update ProjectNode.TryBeginBuild to use IVsBuildManagerAccessor2
The IVsBuildManagerAccessor interface is considered deprecated in VS 2012+. It still works, but there were apparently some design issues with this API.
We should rewrite this in terms of IVsBuildManagerAccessor2.AcquireBuildResources and #ifdef the VS 2010 version (until we drop support for it completely).