The --build-from-source flag is now deprecated and will soon
be removed along with the need to define an install script.
This will remove a whole category of package manager
warnings about install scripts and "built" dependencies.
Most people don't need to build sharp from source, but for
those that do, a suitable method is now something like:
$ npm install package-that-depends-on-sharp
$ npm explore sharp -- npm run build
Uses the recommended rules apart from complexity/useArrowFunction,
which would affect about 1700 lines of code with little benefit
right now. This is something that can be addressed over time.
