splitting off RPC and friends

[Lyndon Nerenberg]

> The same could be done with NIS/YP, which would allow us to slim down 
> libc by moving xdr & rpc into a separate librpc, and yp into a separate 
> libyp.

RPC and XDR are far from dead. Are you sure splitting these out is wise? 
We have to keep the code around, for NFS if nothing else. What's the 
benefit of moving the routines into a separate library? This just seems 
to make work for Makefile maintainers.

--lyndon