Merge branch 'ps/upgrade-clar'

Buildfix and upgrade of Clar to a newer version. * ps/upgrade-clar: cmake: set up proper dependencies for generated clar headers cmake: fix compilation of clar-based unit tests Makefile: extract script to generate clar declarations Makefile: adjust sed command for generating "clar-decls.h" t/unit-tests: update clar to 206accb