Ignore settings on Object.prototype

[EvanHahn]

Before:

app.get('hasOwnProperty');
// => [Function: hasOwnProperty]

app.enabled('hasOwnProperty');
// => true

After:

app.get('hasOwnProperty');
// => undefined

app.enabled('hasOwnProperty');
// => false

See #4802 for more details.

[EvanHahn]

This change isn't strictly related, but I figured we could use the new utility. Happy to revert.

[EvanHahn]

No rush on my end, but let me know if you'd like me to do anything with this PR.

[dougwilson]

thank you! i did end up removing the utils thing since we eventually want to get rid of utils and the only thing it was shared with, the router, was removed in 5.x anyway.