dl: add go1.17.8 and go1.16.15

Change-Id: Ie7c1ffae26803b8b93554855a8f6fbeda5eed96f
Reviewed-on: https://go-review.googlesource.com/c/dl/+/389874
Reviewed-by: Carlos Amedee <carlos@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alex Rakoczy <alex@golang.org>

go1.16.15/main.go

@@ -0,0 +1,24 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The go1.16.15 command runs the go command from Go 1.16.15.
+//
+// To install, run:
+//
+//     $ go install golang.org/dl/go1.16.15@latest
+//     $ go1.16.15 download
+//
+// And then use the go1.16.15 command as if it were your normal go
+// command.
+//
+// See the release notes at https://go.dev/doc/devel/release#go1.16.minor.
+//
+// File bugs at https://go.dev/issue/new.
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.16.15")
+}

go1.17.8/main.go

@@ -0,0 +1,24 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The go1.17.8 command runs the go command from Go 1.17.8.
+//
+// To install, run:
+//
+//     $ go install golang.org/dl/go1.17.8@latest
+//     $ go1.17.8 download
+//
+// And then use the go1.17.8 command as if it were your normal go
+// command.
+//
+// See the release notes at https://go.dev/doc/devel/release#go1.17.minor.
+//
+// File bugs at https://go.dev/issue/new.
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.17.8")
+}