devel/git-cinnabar: mark BROKEN after r479678

../helper/cinnabar-fast-import.c:390:23: error: too few arguments to function call, expected 2, have 1

c = lookup_commit(oid);
    ~~~~~~~~~~~~~    ^

./commit.h:66:1: note: 'lookup_commit' declared here
struct commit *lookup_commit(struct repository *r, const struct object_id *oid);
^