Updating Node-gyp bindings file

[dlaezza-jabra]

The bindings.gyp could definitely use some love. This is a small refactoring, aiming to:

• Use variables for Windows and Mac too.
• Get rid of the version number on Linux.

[ghost]

Great - this has been something on my wishlist for a while :-) Just be careful to test this very well.

[dlaezza-jabra]

What do you mean by testing it well? I can only think of trying it on windows, both on our machines and in the Azure cloud (we set up a pipeline, as you maybe can see)

[tfroehlich-jabra]

Windows and Mac look good, but I don't see any Linux changes?

[dlaezza-jabra]

This is a work-in-progress. I wanted to test whether this built on the cloud, and the easiest way I found so far is to make a pull request