POSIX timer support

[Ulrich Drepper]

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I've added support to use the kernel POSIX timers to nptl.  I'll make a
new source drop with the code soon.  The implementation changes the
existing interface a bit.  The old interface used timer_t == int.  The
new has timer_t == void*.  The old code limited the number of timers
which is now particularly bad if the kernel has independent limits.  The
new code is also faster due to the missing centralized bookkeeping.

Obviously only 64-bit platforms are affected which limits the possible
problems significantly.  nptl contains appropriate compatibility code to
for the 64-bit archs.

LT does not have the new interfaces.  This is no problem since there it
is not possible to mix and match librt and libpthread from nptl and LT.

- -- 
- --------------.                        ,-.            444 Castro Street
Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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