serve restic: disable for go1.16 and earlier after update

cmd/serve/restic/cache.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/cache_test.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/restic.go

@@ -1,4 +1,8 @@
 // Package restic serves a remote suitable for use with restic
+
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/restic_appendonly_test.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/restic_privaterepos_test.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/restic_test.go

@@ -1,6 +1,9 @@
 // Serve restic tests set up a server and run the integration tests
 // for restic against it.
 
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/restic_unsupported.go

@@ -0,0 +1,14 @@
+// Build for restic for unsupported platforms to stop go complaining
+// about "no buildable Go source files "
+
+//go:build !go1.17
+// +build !go1.17
+
+package restic
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// Command definition for cobra
+var Command *cobra.Command

cmd/serve/restic/restic_utils_test.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (

cmd/serve/restic/stdio_conn.go

@@ -1,3 +1,6 @@
+//go:build go1.17
+// +build go1.17
+
 package restic
 
 import (