Log Message:
Update to 9.12. From the changelog:

- Fix FreeBSD build and tests.
- Explicitly reject overly long tun device names.
- Work around ambiguity between <json.h> from json-parser vs
  json-c (!476).
- Fix symbol versioning for openconnect_set_sni().
- Increase maximum input size from stdin (#579).
- Ignore 0.0.0.0 as NBNS address (!446, vpnc-scripts#58).
- Fix Mac OS build of os-tcp-mtu tool (#612).