Add support of AppendByteOrder for unknown architectures

Unknown architectures (where byte order is determined at runtime) get
support of AppendByteOrder interface (added in Go 1.19) in addition to
ByteOrder interface.

generate_go1.19.go

@@ -199,8 +199,10 @@ var Native = binary.{{if .Big}}Big{{else}}Little{{end}}Endian
 
 	const templateOthers = `// Code generated by generate_go1.19.go; DO NOT EDIT.
 
-{{/**/}}//go:build {{range .}}!{{.}} && {{end}}!generate
-{{/**/}}// +build {{range .}}!{{.}},{{end}}!generate
+{{define "go1.19"}}{{if ne . "1.19"}}!{{end}}go1.19{{end -}}
+
+{{/**/}}//go:build {{template "go1.19" .Go}} && {{range .Tags}}!{{.}} && {{end}}!generate
+{{/**/}}// +build {{template "go1.19" .Go}},{{range .Tags}}!{{.}},{{end}}!generate
 
 package endian
 
@@ -212,7 +214,10 @@ import (
 // Native is the byte order of GOARCH.
 // It will be determined at runtime because it was unknown at code
 // generation time.
-var Native binary.ByteOrder
+var Native {{if eq .Go "1.19"}}interface {
+	binary.ByteOrder
+	binary.AppendByteOrder
+}{{else}}binary.ByteOrder{{end}}
 
 func init() {
 	// http://grokbase.com/t/gg/golang-nuts/129jhmdb3d/go-nuts-how-to-tell-endian-ness-of-machine#20120918nttlyywfpl7ughnsys6pm4pgpe
@@ -228,7 +233,16 @@ func init() {
 
 	sort.Strings(knownArchs)
 
-	if err = codegen.MustParse(templateOthers).CreateFile("others.go", knownArchs); err != nil {
-		log.Fatal(err)
+	for _, f := range []*struct {
+		file string
+		data interface{}
+	}{
+		{"others.go", map[string]any{"Tags": knownArchs, "Go": ""}},
+		{"others_go1.19.go", map[string]any{"Tags": knownArchs, "Go": "1.19"}},
+	} {
+		if err = codegen.MustParse(templateOthers).CreateFile(f.file, f.data); err != nil {
+			log.Fatalf("%s: %v", f.file, err)
+		}
 	}
+
 }