The function auth_resolve_groups() is declared in auth.h but has no
definition anywhere in the codebase anymore, let's just drop it.
extern struct userlist *userlist;
struct userlist *auth_find_userlist(char *name);
-unsigned int auth_resolve_groups(struct userlist *l, char *groups);
int userlist_postinit();
void userlist_free(struct userlist *ul);
struct pattern *pat_match_auth(struct sample *smp, struct pattern_expr *expr, int fill);