[windows] fix ntlm usage with tcp socket and buffers setting

cmd/rdpgw/protocol/gateway_windows.go

@@ -7,4 +7,4 @@ import (
 // the fd arg to syscall.SetsockoptInt on Windows is of type syscall.Handle
 func int64ToFd(n int64) syscall.Handle {
 	return syscall.Handle(n)
-}
+}

cmd/rdpgw/web/basic.go

@@ -12,10 +12,6 @@ import (
 	"time"
 )
 
-const (
-	protocolGrpc = "unix"
-)
-
 type BasicAuthHandler struct {
 	SocketAddress string
 	Timeout       int

cmd/rdpgw/web/basic_unix.go

@@ -0,0 +1,7 @@
+// +build !windows
+
+package web
+
+const (
+	protocolGrpc = "unix"
+)

cmd/rdpgw/web/basic_windows.go

@@ -0,0 +1,7 @@
+// +build windows
+
+package web
+
+const (
+	protocolGrpc = "tcp"
+)