gotest: remove lingering references to $GOBIN
gotest: remove lingering references to $GOBIN

(Assumed to be in $PATH.  all.bash ensures that
during the main build and the user must ensure it
when running commands like gotest or gomake
by hand.  This belonged in the earlier CL but I missed it.)

R=r
CC=golang-dev
http://codereview.appspot.com/1967048

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