Log Message:
Update news/libcanlock to 3.1.1

Changelog
=========
3.1.1      2019-12-29
           Bugfix: Potential buffer overflows in code from RFC6234 fixed.
            Related code is used for test suite only, installed library and
            utilities are not affected (Reported by Florian Schlichting)
           Build system: Makefile rules fixed that use DIST_SUBDIRS variable.
           src/canlock.c: Fixed typo in comment (Reported by Urs Janssen)