Use the ArcanistChmodLinter.

Summary: Apply the ArcanistChmodLinter from D9187.

Test Plan: Removed all other linters from the .arclint file and executed arc lint --everything. Confirmed that there were no issues raised.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9188