undo CL 176900044 / 561398621ba7
undo CL 176900044 / 561398621ba7

Turns out it *is* needed because the cmd/link tests expect to find their own files.

??? original CL description
misc/nacl: exclude cmd/link from the test zip.

It does not appear to be necessary, and cmd/link does not appear in release branches.

LGTM=rsc
R=adg, rsc
CC=golang-codereviews
https://codereview.appspot.com/176900044
???

TBR=rsc
R=adg, rsc
CC=golang-codereviews
https://codereview.appspot.com/175870045

bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh