[x/blog] go.empty: add PATENTS file to the subrepo.
[x/blog] go.empty: add PATENTS file to the subrepo.

R=r
CC=golang-dev
https://golang.org/cl/6026043
X-Blog-Commit: ca8b903872a563212611fbebd17d321d319763ad

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website