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Starting with ABI 22, we can ask for the core to unblock a thread from
a wait state, which may include forcing it out of any real-time
scheduling class by demoting it to SCHED_WEAK in the same move.

Export evl_unblock_thread() and evl_demote_thread() as the
corresponding wrappers.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>