cmd/{tailscale,tailscaled}: embed manifest into Windows binaries

This uses a go:generate statement to create a bunch of .syso files that
contain a Windows resource file. We check these in since they're less
than 1KiB each, and are only included on Windows.

Fixes #6429

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I0512c3c0b2ab9d8d8509cf2037b88b81affcb81f

cmd/tailscaled/generate.go

@@ -0,0 +1,10 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+//go:generate go run tailscale.com/cmd/mkmanifest amd64 windows-manifest.xml manifest_windows_amd64.syso
+//go:generate go run tailscale.com/cmd/mkmanifest 386 windows-manifest.xml manifest_windows_386.syso
+//go:generate go run tailscale.com/cmd/mkmanifest arm64 windows-manifest.xml manifest_windows_arm64.syso
+//go:generate go run tailscale.com/cmd/mkmanifest arm windows-manifest.xml manifest_windows_arm.syso

cmd/tailscaled/windows-manifest.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+      <application>
+          <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/> <!-- Windows 7 -->
+          <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/> <!-- Windows 8 -->
+          <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/> <!-- Windows 8.1 -->
+          <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/> <!-- Windows 10 -->
+      </application>
+  </compatibility>
+
+</assembly>