This makes it so that 'go install golang.org/x/tools/cmd/gorename@latest'
will continue to work. ('go install pkg@version' does not allow
replace directives.)

Updates golang/go#69360

Change-Id: I46a16a5d8dc7d1d1cf6c428388484e27f266f4e2
Reviewed-on: https://go-review.googlesource.com/c/tools/+/614635
Auto-Submit: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>