* manager.c (__pthread_nonstandard_stacks): Define only if
THREAD_SELF is not defined.
(pthread_allocate_stack): Always initialize gardaddr to a correct
value.
(pthread_handle_create): Unmap thread with one call.
(pthread_free): Remove test for initial thread before removing stack.
Unmap stack with one call.
* pthread.c (__pthread_initial_thread): Initialize p_userstack to
1 to avoid removing the stack.