internal/releasetargets: target Windows 2016

We dropped support for 7 (aka 2008) and 8 this cycle.

For golang/go#40561.

Change-Id: Iceca7bf866c94587450a9716155fe42aa0ca4d3b
Reviewed-on: https://go-review.googlesource.com/c/build/+/495317
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
diff --git a/internal/releasetargets/releases.txt b/internal/releasetargets/releases.txt
index 89e0549..a3a0e16 100644
--- a/internal/releasetargets/releases.txt
+++ b/internal/releasetargets/releases.txt
@@ -235,10 +235,10 @@
 
 solaris-amd64   solaris    amd64      (cross-compiled, no tests)
 
-windows-386     windows    386        windows-386-2008
+windows-386     windows    386        windows-386-2016
 	Running on GCP
 
-windows-amd64   windows    amd64      windows-amd64-2008
+windows-amd64   windows    amd64      windows-amd64-2016
 	Long tests on windows-amd64-longtest
 	Running on GCP
 
diff --git a/internal/releasetargets/releasetargets.go b/internal/releasetargets/releasetargets.go
index f68f80a..e138994 100644
--- a/internal/releasetargets/releasetargets.go
+++ b/internal/releasetargets/releasetargets.go
@@ -172,6 +172,13 @@
 		},
 		"linux-s390x":   nil,
 		"linux-ppc64le": nil,
+		"windows-386": &Target{
+			Builder: "windows-386-2016",
+		},
+		"windows-amd64": &Target{
+			Builder:         "windows-amd64-2016",
+			LongTestBuilder: "windows-amd64-longtest",
+		},
 		"windows-arm": &Target{
 			Builder:     "windows-arm64-11", // Windows builds need a builder to create their MSIs.
 			SecondClass: true,