Issue #22919: Windows build updated to support VC 14.0 (Visual Studio 2015), which will be used for the official 3.5 release.

use "references" to link to dependent projects.
Update readme and batch files.

branch: vs2010
tag: tip
user: Brian Curtin <brian@python.org>
date: Sun May 13 16:15:11 2012 -0500
summary: Changes to allow Profile Guided Optimization builds to succeed on VS2010