wgengine/router: make windows gracefully handle disabled IPv4 or IPv6.

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This is necessary because either protocol can be disabled globally by a
Windows registry policy, at which point trying to touch that address
family results in "Element not found" errors. This change skips programming
address families that Windows tell us are unavailable.

Fixes #1396.

Signed-off-by: David Anderson <danderson@tailscale.com>

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