{cmd/tailscale/cli,ipn}: add http support to tailscale serve (#8358)

Updates #8357

Signed-off-by: Shayne Sweeney <shayne@tailscale.com>

ipn/ipn_clone.go

@@ -103,6 +103,7 @@ func (src *TCPPortHandler) Clone() *TCPPortHandler {
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _TCPPortHandlerCloneNeedsRegeneration = TCPPortHandler(struct {
 	HTTPS        bool
+	HTTP         bool
 	TCPForward   string
 	TerminateTLS string
 }{})