This is a port of a525c7244e .
Original commit message:
Gyp update to be able to generate VS2015 projects.
PR-URL: https://github.com/joyent/node/pull/25857
Reviewed-By: Alexis Campailla <alexis@janeasystems.com>
PR-URL: https://github.com/nodejs/node/pull/2843
Reviewed-By: rvagg - Rod Vagg <rod@vagg.org>
Reviewed-By: orangemocha - Alexis Campailla <orangemocha@nodejs.org>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>
f0fba0bce8