wintun: wait for interface registry key on device creation

By using RegNotifyChangeKeyValue(). Also disable dead gateway detection.

Signed-off-by: Simon Rozman <simon@rozman.si>

tun/wintun/registry/mksyscall.go

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package registry
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zregistry_windows.go registry_windows.go