Start including <sys/sysproto.h> to get the correct args structs and

prototypes for all syscalls.  The args structs are still declared in
comments as in VOP implementation functions.  I don't like the
duplication for this, but several more layers of changes are required
to get it right.  First we need to catch up with 4.4lite2, which uses
macros to handle struct padding.  Then we need to catch up with NetBSD,
which passes the args correctly (as void *).  Then we need to handle
varargs functions and struct padding better.  I think all the details
can be hidden in machine-generated functions so that the args structs
and verbose macros to reference them don't have to appear in the core
sources.

Add prototypes.

Add bogus casts to hide the evil type puns exposed by the previous
steps.  &uap[1] was used to get at the args after the first.  This
worked because only the first arg in *uap was declared.  This broke
when the machine- genenerated args struct declared all the args
(actually it declares extra args in some cases and depends on the
user stack having some accessible junk after the last arg, not to
mention the user args being on the stack.  It isn't possible to
declare a correct args struct for a varargs syscall).  The msgsys(),
semsys() and shmsys() syscall interfaces are BAD because they
multiplex several syscalls that have different types of args.
There was no reason to duplicate this sysv braindamage but now
we're stuck with it.  NetBSD has reimplemented the syscalls properly
as separate syscalls #220-231.

Declare static functions as static in both their prototype and their
implementation (the latter is optional, and this misfeature was used).

Remove gratuitous #includes.

Continue cleaning up new init stuff.

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