Extract cross-platform condition variable support into a separate file and
provide user-mode non-recursive locks for Windows.

the dll importer on windows to fail.

"missing dependency", causing pythocore to be rebuilt every time.

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