comms/gammu: upgrade to 1.42.0
Major changes:
- Fixed compilation on some non GNU systems.
- Localization updates.
- Improved CNMI command compatibility for AT module.
- Improved getting of network and manufacturer information in AT module.
- Improved compatibility with D-Link modems that need to power on.
- Dropped Python 2 compatibility from utility scripts.
- Fixed bug in deleting SMS messages.
Full changelog: https://fr.wammu.eu/news/2020/10/03/gammu-1-42-0/