Add cppcheck to base image setup

Summary: See my comment here: https://reviews.bitcoinabc.org/D6549#inline-41181 The land bot will need this.

Test Plan: Verify diff builds install cppcheck

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6645