rpc: Fix xdr_* macros and limit buffer sizes.

While there, constify few things.

Taken-from: FreeBSD

RPC: replace Sun license with 3-clause BSD license.

Original commit message:
"Replace Sun RPC license in TI-RPC library with a 3-clause BSD license,
with the explicit permission of Sun Microsystems

RPC: replace Sun license with 3-clause BSD license.

Original commit message:
"Replace Sun RPC license in TI-RPC library with a 3-clause BSD license,
with the explicit permission of Sun Microsystems in 2009."

Taken-from: FreeBSD
Cherry-picked-from: http://svnweb.freebsd.org/base?view=revision&revision=258578

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Remove some unexpanded $DragonFly$ IDs in our tree.

Bring in a transport-independent RPC (TI-RPC).

-rpcbind replaces portmap which is more secure.
-Essentially this is the same thing FreeBSD did over 7 years ago (svn
revision #74462).
-This also upda

Bring in a transport-independent RPC (TI-RPC).

-rpcbind replaces portmap which is more secure.
-Essentially this is the same thing FreeBSD did over 7 years ago (svn
revision #74462).
-This also updates utilities and the kernel build associated with this
change.

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