'RELENG_2_2_8_RELEASE'.

This commit was manufactured to restore the state of the 2.2.8-RELEASE image.
Releases prior to 5.3-RELEASE are omitting the secure/ and crypto/ subdirs.

a bunch of system include files.

it 1138 times (:-() in casts and a few more times in declarations.
This change is null for the i386.

The type has to be `typedef int vop_t(void *)' and not `typedef
int vop_t()' because `gcc -Wstrict-prototypes' warns about the
latter.  Since vnode op functions are called with args of different
(struct pointer) types, neither of these function types is any use
for type checking of the arg, so it would be preferable not to use
the complete function type, especially since using the complete
type requires adding 1138 casts to avoid compiler warnings and
another 40+ casts to reverse the function pointer conversions before
calling the functions.

it was referenced from.. stops a rather annoying panic, but
introduces a rather interesting but "I can live with it" bug
`ln a b ; mv a b; echo ?`
returns a rather than b..
I know why but I need to think of the 'correct' answer. at least this is 'safe'

added prototypes for every function and
put (void *) as the args to the vop array definitions.

can now compile with:
CWARNFLAGS?=    -W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit \
                -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes \
                -Winline -Wstrict-prototypes
and only get errors for files external to this module:
namely
./vnode_if.h
../../sys/vnode.h
../../sys/buf.h
../../miscfs/specfs/specdev.h

if this keeps simplifying there won't be any left :)