[kaffe] Pthreads diff

[Eric Anholt]

Attached is a patch for a few things I noticed while going through
pthreads:

- jthread_atexit wasn't implemented, so runfinalizer wouldn't get
called.
- jthread_spinon/off wasn't implemented (used in
enter/leaveUnsafeRegion), so there may have been thread-unsafeness in
some library stuff.
- incr/decr of nonDaemons wasn't protected by locking.
- Fix a case of pendingExits not being protected by locking.

Does this patch look sane?

Related notes:
- tWatchdogRun could use some locking.

-- 
Eric Anholt                                eta at lclark.edu          
http://people.freebsd.org/~anholt/         anholt at FreeBSD.org
           Thank goodness for the 22nd Amendment

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