Make release with ARM64 Windows support

[jkunkee]

Summary: Please cut a node-gyp release with full ARM64 support within the next few weeks so it can make it downstream to Electron 6.

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What changes? #1655, #1679, and #1739

Who and Why? I am working at Microsoft in tandem with a couple of our partners to bring ARM64 Windows support to Electron 6. Per nodejs/node#25998, this requires making a node-gyp release with these changes so that the release can be consumed downstream (in npm and thence in Node.js proper).

When? Electron 6 has a major release coming up, Electron 6 is based on Node.js v12, and it will take some time to get npm and Node.js and Node.js v12 to receive these changes, so I am really hoping for this to happen in the next three weeks or so.

How? Landing these three changes in the v5.0.0 release proposal, #1723, would be fine, and @joaocgreis has already made the request there.

If v5.0.0 needs more time due, perhaps, to requests for Python 3 and VS 2019 support, these three changes could (I believe) stand alone and so could be part of a v4.1.0 or even a v4.0.1 release.

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I'm happy to help this happen any way I can and figured posting an issue would be a good start.

[jkunkee]

This is resolved by the v5.0.0 release in #1723. Thanks @rvagg!