syscall separation part 5a

[David P. Reese, Jr.]

This is a replacement for the previous patch that makes kern_{send,recv}msg()
operate on struct uio's instead of struct msghdr's.  This is what I believe
to be the last step required before removing stackgap allocations in the
linux socket code.

http://gomerbud.com/daver/patches/dragonfly/syscall-separation-5a.diff

I'd like to commit this tomorrow night.

-- 
   David P. Reese, Jr.                                     daver at xxxxxxxxxxxx
                                               http://www.gomerbud.com/daver/