SEBSD MAC Kernel build - AMD64

[Dingo]

After your checkin today I am running SEBSD on AMD64 it did compile and
build a MAC kernel and booted fine. So far so good, ill  get some
testing thru both architectures. 

On Mon, 2006-03-20 at 11:30 -0500, Todd Miller wrote:
> The arg parameters to mac_thread_syscall_* should probably be  
> register_t *
> not int * so they match the machine word size.
> 
>   - todd