tool/goexe: refactor to use windows_sys

Updates #19255

Signed-off-by: Nathan Perry <nathan@tailscale.com>
Change-Id: Idf69f23b5a61417d5fa3638a276d64856a6a6964
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f