wgengine/magicsock,net/sockopts: export Windows ICMP suppression logic (#16917)

For eventual use by net/udprelay.Server.

Updates tailscale/corp#31506

Signed-off-by: Jordan Whited <jordan@tailscale.com>

net/sockopts/sockopts_notwindows.go

@@ -0,0 +1,15 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !windows
+
+package sockopts
+
+import (
+	"tailscale.com/types/nettype"
+)
+
+// SetICMPErrImmunity is no-op on non-Windows.
+func SetICMPErrImmunity(pconn nettype.PacketConn) error {
+	return nil
+}