Reland of Change default Windows compiler to VS 2015
The change to get_landmines.py is there because modifying this file
affects analyze behavior so that all tests run. Changing the printed
message is purely a side effect.
This change also removes some redundant INCLUDE paths. These are
unnecessary when building with VS 2015 (because it defaults to the
Windows 10 SDK) and actively harmful (they make the INCLUDE path
This change was redone in order to fix merge conflicts and because after
a few weeks a fresh set of approvals seems reasonable.
The original change was landed as crrev.com/1598493004