This reverts commit 69e497f68127cad345fd13786c5342822c58173f.
In order to ensure the detached thread obtain the correct return
value from pthread_join()/pthread_cancel(), the detached thread
will create joininfo to save the detached status after thread
destroyed. If there are too many of detached threads in the
process group, the joininfo will consume too much memory.
This is not friendly to embedded MCU devices.
This commit keep the semantics as #11898 was introduced,
will no longer save joininfo for detached threads to avoid wasting memory.
Refer PR:
https://github.com/apache/nuttx/pull/12106
Signed-off-by: chao an <anchao@lixiang.com>