decide based on the resolved path

[thefourtheye]

as per @vkurchatkin's suggestion, made in nodejs/node#3307 (comment), this can be decided without a
predefined list of module names.

[sindresorhus]

I don't really see the benefit. This just adds a lot of overhead. Right now it uses process.binding('natives'). I hope by the time that API goes away, Node.js will have an officially exposed list of builtins, otherwise I'll just use the static list which most likely won't change much anyways.