[dev.typeparams] cmd/go: include new internal packages in...

[dev.typeparams] cmd/go: include new internal packages in TestNewReleaseRebuildsStalePackagesInGOPATH

CL 328336 introduced two new packages that the runtime and other
low-level packages depend on. Include them as targets to copy in this
test with other such packages.

Fixes the dev.typeparams longtest builders.

Change-Id: Ia886f0264962a68acd06ebca002eef8515f06487
Reviewed-on: https://go-review.googlesource.com/c/go/+/329251


Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>