go.crypto/ssh: import gosshnew.

See https://groups.google.com/d/msg/Golang-nuts/AoVxQ4bB5XQ/i8kpMxdbVlEJ

R=hanwen
CC=golang-codereviews
https://golang.org/cl/86190043

ssh/mac.go

@@ -43,11 +43,6 @@ func (t truncatingMAC) Size() int {
 
 func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() }
 
-// Specifies a default set of MAC algorithms and a preference order.
-// This is based on RFC 4253, section 6.4, with the removal of the
-// hmac-md5 variants as they have reached the end of their useful life.
-var DefaultMACOrder = []string{"hmac-sha1", "hmac-sha1-96"}
-
 var macModes = map[string]*macMode{
 	"hmac-sha1": {20, func(key []byte) hash.Hash {
 		return hmac.New(sha1.New, key)