A patch for sunrpc

[Roland McGrath]

> I forgot to mention that my patch is for glibc 2.1, which still uses
> select for rpc, since it is what we are using today. We have no plan
> to move glibc 2.2 any time soon. But we do want to support larger
> NR_OPEN.

Ah.  Well, given that `fd_set svc_fdset' defined using FD_SETSIZE is part
of the -lrpcsvc interface, I don't think you can get away with messing with
that.  The obvious way to easily support fds is to use poll, like glibc-2.2
does.