loaded at runtime.


extra/comp_err.c:
  Don't use DBUG after my_end, crashes on Windows with USE_TLS.
include/my_dbug.h:
  Add missing DBUG_LEAVE in non-debug builds.
include/my_pthread.h:
  Add comment explaining USE_TLS.
libmysql/cmakelists.txt:
  Add USE_TLS to avoid crashing when loading libmysql.dll at runtime.
mysys/cmakelists.txt:
  Add USE_TLS to avoid crashing when loading libmysql.dll at runtime.
mysys/my_init.c:
  Don't use DBUG after my_thread_end(), as it crashes on Windows TLS.