Update ctr so it works again on windows

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

server/server_linux.go

@@ -8,6 +8,13 @@ import (
 	"github.com/containerd/containerd/sys"
 )
 
+const (
+	// DefaultAddress is the default unix socket address
+	DefaultAddress = "/run/containerd/containerd.sock"
+	// DefaultDebuggAddress is the default unix socket address for pprof data
+	DefaultDebugAddress = "/run/containerd/debug.sock"
+)
+
 // apply sets config settings on the server process
 func apply(ctx context.Context, config *Config) error {
 	if config.Subreaper {

server/server_unsupported.go

@@ -1,9 +1,16 @@
-// +build !linux
+// +build !linux,!windows
 
 package server
 
 import "context"
 
+const (
+	// DefaultAddress is the default unix socket address
+	DefaultAddress = "/run/containerd/containerd.sock"
+	// DefaultDebuggAddress is the default unix socket address for pprof data
+	DefaultDebugAddress = "/run/containerd/debug.sock"
+)
+
 func apply(_ context.Context, _ *Config) error {
 	return nil
 }

server/server_windows.go

@@ -0,0 +1,16 @@
+// +build windows
+
+package server
+
+import "context"
+
+const (
+	// DefaultAddress is the default winpipe address
+	DefaultAddress = `\\.\pipe\containerd-containerd`
+	// DefaultDebugAddress is the default winpipe address for pprof data
+	DefaultDebugAddress = `\\.\pipe\containerd-debug`
+)
+
+func apply(_ context.Context, _ *Config) error {
+	return nil
+}