Doesn't work with node worker threads

[yocontra]

Related: https://github.com/nodejs/node/issues/21783

Info about how to fix it: https://github.com/nodejs/node/blob/master/doc/api/addons.md#context-aware-addons

Example of a native module fixing it: https://github.com/schroffl/node-lzo/pull/11/files

Let me know if you want me to take a swing at it with a PR, looks like it isn't a complex fix.

[stefanocudini]

@yocontra on which gdal method did you plan to apply it?

I wanted to optimize the reading of geotiff