libgo: install new 1.16 packages

Change-Id: I678db6a6528627de3e77f9f4e48eb80d6a8831f7
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/289069
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2 files changed