Log Message:
news/libcanlock: Update to 3.3.0

Library API and ABI are backward compatible.

- Bugfix: Potential NULL-pointer dereference fixed in canlock utility
  (Reported by Dennis Preiser)
- Bugfix: Multiple bugs in test suite fixed, where return values
  from library functions were not handled correctly
  (Reported by Dennis Preiser)
- Bugfix: Two memory leaks fixed in test suite for legacy API
  (Found by Valgrind)
- Bugfix: NAME sections of cl_clear_secret(), cl_get_lock(), cl_split()
  and cl_verify() man pages fixed
  (Reported by Julien Élie)
- Bugfix: Typos in comments and documentation fixed
  (Reported by Urs Janßen)
- New libcanlock API function cl_verify_multi() added to check multiple
  keys against multiple locks
- Test suite extended: It now tests cl_verify_multi() too
- canlock utility now supports the option "-m" to check multiple keys
  against multiple locks
- Option "-m" added to SYNOPSIS section of canlock man page
  (Suggested by Marcel Logen)
- Example programs added to the "examples" subdirectory
  (Suggested by Julien Élie)
- Documentation for RFC 8315 Section 4 added to cl_get_key() and
  cl_get_lock() man pages
  (Suggested by Julien Élie)
- Paragraph for optional User-ID (<uid> in RFC 8315 notation) added to
  cl_get_key() and cl_get_lock() man pages
  (Suggested by Julien Élie)
- Examples for minimum size of local secret added to cl_get_key() and
  cl_get_lock() man pages
  (Suggested by Julien Élie)
- Removed some redundant notes from the output of "canlock -h"
  (Suggested by Julien Élie)