Prototypes for split syscalls

["David P. Reese Jr." <daver@xxxxxxxxxxxx>]

Now that we are splitting copy{in,out} from the actual syscall functions,
we need a place to put the prototypes for the second level functions.
Because the second level functions have the name of the ordinary syscall
suffixed with a numeral one, I think a logical place to put these prototypes
is in src/sys/sys/syscall1.h.

Any objections?

-- 
   David P. Reese, Jr.                                     daver@xxxxxxxxxxxx