syscall: fix socketpair in syscall_bsd
syscall: fix socketpair in syscall_bsd

THIS WILL BREAK THE BUILD.

The z files have socketpair code in them that was
written by hand; breaking the build with this is the first
step in getting rid of that hand-written code.

R=adg
TBR=adg
CC=golang-dev
http://codereview.appspot.com/2197050

mhennings/marcohennings-go,bryanxu/go-zh,d0f/go-zh,scirelli/scirelli-go,sanjosh/sanjos100-tipc,npe9/noahevans-go9,mhennings/marcohennings-go,npe9/noahevans-go9,scirelli/scirelli-go,npe9/noahevans-go9,rflanagan/reginaldflanagan-project1,glycerine/jeaten-go-arrayof-structof,npe9/noahevans-go9,rdp/rogerpack2005-golang,d0f/go-zh,mhennings/marcohennings-go,bryanxu/go-zh,Triskite/willstone-goclone,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,rflanagan/reginaldflanagan-project1,webfd/go-zh,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,Triskite/willstone-goclone,mhennings/marcohennings-go,rdp/rogerpack2005-golang,Triskite/willstone-goclone,webfd/go-zh,bryanxu/go-zh,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,Triskite/willstone-goclone,npe9/noahevans-go9,npe9/noahevans-go9,d0f/go-zh,rdp/rogerpack2005-golang,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,mhennings/marcohennings-go,webfd/go-zh,sanjosh/sanjos100-tipc,scirelli/scirelli-go,bryanxu/go-zh,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,rdp/rogerpack2005-golang,bryanxu/go-zh,d0f/go-zh,d0f/go-zh,npe9/noahevans-go9,d0f/go-zh,Triskite/willstone-goclone,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,scirelli/scirelli-go,scirelli/scirelli-go,bryanxu/go-zh,rdp/rogerpack2005-golang,mhennings/marcohennings-go,webfd/go-zh,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,Triskite/willstone-goclone,rdp/rogerpack2005-golang,scirelli/scirelli-go,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,bryanxu/go-zh,Triskite/willstone-goclone,scirelli/scirelli-go,bryanxu/go-zh,webfd/go-zh,webfd/go-zh