[VS Addin] Set the 'NonCoreWin' property to 'true'

Without this the MS build files for 2012 were adding the
core windows libraries to the list of dependencies.

This fixes the 2012 tests which are currently failing on
the bots.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/79873002

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1568 050acbb0-2703-11df-ab0a-9f3f633ae91d
1 file changed