core: thread_flags: THREAD_FLAG_MUTEX_UNLOCKED, THREAD_FLAG_TIMEOUT are not used #7543
Description
Follow up to #7533. I found that there are two other predefined constants which are not used in the tree.
THREAD_FLAG_MUTEX_UNLOCKEDTHREAD_FLAG_TIMEOUT
I think the constants may be intended for xtimer_msg_timeout, which mentions core_thread_flags in the documentation, but does not in fact use thread flags for the implementation.