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

cmd/rdpgw/protocol/gateway_windows.go

@@ -49,7 +49,7 @@ func (g *Gateway) setSendReceiveBuffers(conn net.Conn) error {
 	if !ptrSysFd.IsValid() {
 		return errors.New("cannot find Sysfd field")
 	}
-	fd := int(ptrSysFd.Int())
+	fd := ptrSysFd.Uint()
 
 	if g.ReceiveBuf > 0 {
 		err := syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUF, g.ReceiveBuf)

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"
+)