Re-enable torproject-obfs4proxy APT sources once they have packages newer than Stretch's ones
i.e. revert 5e5cb9179e5cc9c479ce90f8ea6fd7dfb7d3bf03
Related issues
- Related to #12308 (closed)
- Blocks #13234 (closed)
Original created by @intrigeri on 12310 (Redmine)