Log Message:
Update opencpn to 4.8.8. Changes since 4.8.6:
This version is a maintenance release of OpenCPN, improving reliability and
compatibility for all supported platforms.
Changes and improvements include:

1. Make higher baud rates available on POSIX systems where supported.
2. Update Finnish translations.
3. Improve plugin ENC overlay rendering.
4. Improve serial port detection logic on Mac systems.
5. Improve ENC update processing logic.