[UNFINISHED] Fix handling of have_kernel_resources on Mach/Hurd.

<http://lists.gnu.org/archive/html/bug-hurd/2009-04/msg00028.html>

Further comments by Neal:

<neal> do you want a reply on the libpthread one inline?
<neal> the short answer is: yes, that's a bug
<neal> unfortunately, your fix is not enough
<neal> the predicate controls two resources: the wakeup port and the thread
  itself
<tschwinge> Oh, right, I see.
<neal> also, there may be a race:
<neal> set the predicate to free, then kill the thread
<neal> that's not so good
<neal> so a proper solution requires a bit more thought
<tschwinge> I think I wondered about that as well.  But isn't there the same
  problem with Viengoos?
<neal> it is difficult as cleanly committing suicide is hard :-)
<neal> could be
<neal> on viengoos, I don't actually deallocate the thread in pt-thread-halt.c
<neal> I just call suspend
<neal> the thread is only deallocated in pt-thread-dealloc.c

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