Blame nptl/TODO

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- we should probably extend pthread_mutexattr_t with a field to create a
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  single linked list of all instances.  This requires changing the
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  pthread_mutexattr_* functions.
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- a new attribute for mutexes: number of times we spin before calling
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sys_futex
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- for adaptive mutexes: when releasing, determine whether somebody spins.
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If yes, for a short time release lock.  If someone else locks no wakeup
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syscall needed.
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- test with threaded process terminating and semadj (?) being applied
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  only after all threads are gone
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- semaphore changes:
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  - sem_post should only wake one thread and only when the state of
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    the semaphore changed from 0 to 1
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    this also requires that sem_wait and sem_timedwait don't drop the
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    post if they get canceled.
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  - possibly add counter field.  This requires reviving the
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    differences between old and new semaphose funtions.  The old ones
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    stay as they are now.  The new once can use an additional field
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    wich is the counter for the number of waiters