go.tools/cmd/cover: fix build Need the ./ for the path. Quick fix to get the build green, but what really is the right answer for Windows?
go.tools/cmd/cover: fix build
Need the ./ for the path. Quick fix to get the build green, but what really is the right answer for Windows?

R=golang-dev
CC=golang-dev
https://codereview.appspot.com/10359044

t-yuki/go.tools.old,tmc/mirror-go.tools,tmc/mirror-go.tools,t-yuki/go.tools.old,tmc/mirror-go.tools,t-yuki/go.tools.old