RPC changes

[Ulrich Drepper]

I've checked in a patch I got quite some time ago and which I delayed
for the 2.2 release.  It is introducing thread-safe RPC functions,
similar to what Solaris has.  This should not introduce
incompatibilities since programs currently using RPC functions in
different threads are doomed.

I had to modify the patch quite a lot and have done only a tiny bit of
testing myself.  Please test it out.

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