On recent SDKs the size of the toolchain package grew. This change
filters out some unneeded directories in order to minimize this growth.

This change also fixes the bin paths for the 10.0.15063.0 SDK. Starting
with this SDK version the SDK version is part of the path. The script
does *not* handle packaging older SDKs anymore - older versions of the
script can be used for that purpose.

The 10.0.15063.0 SDK will be needed eventually in order to support
Windows 10 Creators Update.

Test builds are running on crrev.com/2913873003 (VS 2017) and
crrev.com/2914643003 (VS 2015).

Bug: 683729,682416
Change-Id: Ia89e3253869a45dd10c923a2edee53aaf086e12c
Reviewed-on: https://chromium-review.googlesource.com/519982
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>