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The existing code relied on the Go build cache to avoid needless work when obtaining the tailscale binaries. For non-obvious reasons, the binaries were getting re-linked every time, which added 600ms or so on my machine to every test. Instead, build the binaries exactly once, on demand. This reduces the time to run 'go test -count=5' from 34s to 10s on my machine. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>