cpplint: declare bankruptcy

[vapier]

We have not pushed updates to the public cpplint code from our internal version in years. No one seems interested in picking it up either.

Since an open source community has formed & forked & updated it, let's delete our ancient version and just send people to that project now.

[vapier]

@jdennett @fowles @dinord @gpshead @markmentovai

[yatink-ci]

only know your lover when you let her go...