linux COMPAT_43 removal part 3

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

Make the linux_{send,recv}*() and linux_{get,set}sockopt() syscalls use
the new split syscalls.

http://gomerbud.com/daver/patches/dragonfly/linux-no43-3.diff

There is only one more stackgap allocation in linux_socket.c.  It shall
be removed very soon.

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