Copy missing globals from `builtin` to `es*`

While investigating why eslint wouldn't pick up the BigInt globals, I noticed eslint does not use builtin like I previously assumed. I'd like to propose to copy any globals missing in either es5, es2015, es2017 but present in builtin to one of those respective environments.

Afterwards, I'd copy back any potential globals from the es* categories to builtin so that it ends up containing all globals from those categories. Alternatively, builtincould be generated dynamically in index.js, I think actually, that'd be my preference to avoid future inconsistency.