According to msdn doc, _endthreadex(0) is to be used when thread is
 launched with _beginthreadex().

Note that when returning from the normal path, an implicit _endthreadex is
issued anyway.  It is important to be consistent whatever the path, since
those final functions (_endthread, ExitThread, _endthreadex) don't have
the same deallocation policy.
(cherry picked from commit 99f71e5a62fdd14b031fdc89f452d873e3509c74)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>