Add an error message when not using clang-format 4.0

Summary: Also configure clang-format-4.0 as a possible binary name as this is how ubuntu/debian type distro name it.

Test Plan:

arc lint

Reviewers: #bitcoin_abc, schancel

Reviewed By: #bitcoin_abc, schancel

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1680