cmd/go/testdata/mod: add golang toolchain test data for openbsd/ppc64

Updates #56001

Change-Id: Ic7b4ecb2e471292894c54610e8acda8822c890fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/518275
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/go/testdata/mod/golang.org_toolchain_v0.0.1-go1.999testmod.openbsd-ppc64.txt

@@ -0,0 +1,14 @@
+golang.org/toolchain@v0.0.1-go1.999testmod.openbsd-ppc64
+
+-- .mod --
+module golang.org/toolchain
+-- .info --
+{"Version":"v0.0.1-go1.999testmod.openbsd-ppc64"}
+-- go.mod --
+module golang.org/toolchain
+-- bin/go --
+#!/bin/sh
+echo go1.999testmod here!
+-- bin/gofmt --
+echo i am unused
+-- pkg/tool/fake --