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25d5f78c6e
updates tailscale/corp#27145 We require a means to trigger a recompilation of the DNS configuration to pick up new nameservers for platforms where we blend the interface nameservers from the OS into our DNS config. Notably, on Darwin, the only API we have at our disposal will, in rare instances, return a transient error when querying the interface nameservers on a link change if they have not been set when we get the AF_ROUTE messages for the link update. There's a corresponding change in corp for Darwin clients, to track the interface namservers during NEPathMonitor events, and call this when the nameservers change. This will also fix the slightly more obscure bug of changing nameservers while tailscaled is running. That change can now be reflected in magicDNS without having to stop the client. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>