chore: remove tfo windows support

Golang officially decided not to open `internal/poll.execIO` to third-party libraries after 1.23 was released, so we can only choose to remove tfo support on the Windows platform.

component/dialer/tfo.go

@@ -5,12 +5,8 @@ import (
 	"io"
 	"net"
 	"time"
-
-	"github.com/metacubex/tfo-go"
 )
 
-var DisableTFO = false
-
 type tfoConn struct {
 	net.Conn
 	closed bool
@@ -124,16 +120,3 @@ func (c *tfoConn) ReaderReplaceable() bool {
 func (c *tfoConn) WriterReplaceable() bool {
 	return c.Conn != nil
 }
-
-func dialTFO(ctx context.Context, netDialer net.Dialer, network, address string) (net.Conn, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), DefaultTCPTimeout)
-	dialer := tfo.Dialer{Dialer: netDialer, DisableTFO: false}
-	return &tfoConn{
-		dialed: make(chan bool, 1),
-		cancel: cancel,
-		ctx:    ctx,
-		dialFn: func(ctx context.Context, earlyData []byte) (net.Conn, error) {
-			return dialer.DialContext(ctx, network, address, earlyData)
-		},
-	}, nil
-}

component/dialer/tfo_unix.go

@@ -0,0 +1,25 @@
+//go:build unix
+
+package dialer
+
+import (
+	"context"
+	"net"
+
+	"github.com/metacubex/tfo-go"
+)
+
+const DisableTFO = false
+
+func dialTFO(ctx context.Context, netDialer net.Dialer, network, address string) (net.Conn, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), DefaultTCPTimeout)
+	dialer := tfo.Dialer{Dialer: netDialer, DisableTFO: false}
+	return &tfoConn{
+		dialed: make(chan bool, 1),
+		cancel: cancel,
+		ctx:    ctx,
+		dialFn: func(ctx context.Context, earlyData []byte) (net.Conn, error) {
+			return dialer.DialContext(ctx, network, address, earlyData)
+		},
+	}, nil
+}

component/dialer/tfo_windows.go

@@ -1,11 +1,12 @@
 package dialer
 
-import "github.com/metacubex/mihomo/constant/features"
+import (
+	"context"
+	"net"
+)
 
-func init() {
-	// According to MSDN, this option is available since Windows 10, 1607
-	// https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596(v=vs.85).aspx
-	if features.WindowsMajorVersion < 10 || (features.WindowsMajorVersion == 10 && features.WindowsBuildNumber < 14393) {
-		DisableTFO = true
-	}
+const DisableTFO = true
+
+func dialTFO(ctx context.Context, netDialer net.Dialer, network, address string) (net.Conn, error) {
+	return netDialer.DialContext(ctx, network, address)
 }