cmd/release: fix test failure from earlier FreeBSD update

Release on FreeBSD 11.1 now, not 11.0.

Change-Id: Idfa5b51796513a613d4a3a3cafa817cb6b1999a8
Reviewed-on: https://go-review.googlesource.com/80303
Reviewed-by: Andrew Bonventre <andybons@golang.org>

cmd/release/release.go

@@ -192,13 +192,13 @@ var builds = []*Build{
 	{
 		OS:      "freebsd",
 		Arch:    "386",
-		Builder: "freebsd-386-110",
+		Builder: "freebsd-386-11_1",
 	},
 	{
 		OS:      "freebsd",
 		Arch:    "amd64",
 		Race:    true,
-		Builder: "freebsd-amd64-110",
+		Builder: "freebsd-amd64-11_1",
 	},
 	{
 		OS:      "windows",