This change updates the packaging script for VS 2015 Update 1. Changes
include:

- Filtering out Windows Performance Toolkit to save space
- Filtering out .msi files to save space
- Adding a 'dryrun' option to quickly print statistics
- Allowing specifying what OS sub-version is desired
- Filtering out unused versions from the include/lib/source directories
- Avoiding the double-include of the ucrt directory
- Adding ucrt directory to include and lib path
- Handling running from 64-bit or 32-bit python

R=scottmg@chromium.org
BUG=chromium:440500

Review URL: https://codereview.chromium.org/1504983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297894 0039d316-1c4b-4281-b951-d872f2087c98