We're about to commit some wide-sweeping changes to the go-tour and I
would rather not include them in Go 1.2.1, which is due in the next
week or so.

Also fix the makerelease tool; it has been broken since it was
renamed from bindist.

LGTM=campoy
R=campoy
CC=golang-codereviews
https://golang.org/cl/68780043