HEIMDAL_RWLOCK_init
#define HEIMDAL_RWLOCK_init(l) do { } while(0)
#define HEIMDAL_RWLOCK_init(l) do { } while(0)
#define HEIMDAL_RWLOCK_init(l) rwlock_init(l, NULL)
#define HEIMDAL_RWLOCK_init(l) pthread_rwlock_init(l, NULL)