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Updates tailscale/tailscale#1634 Logs from some iOS users indicate that we're pointlessly performing captive portal detection on certain interfaces named ipsec*. These are tunnels with the cellular carrier that do not offer Internet access, and are only used to provide internet calling functionality (VoLTE / VoWiFi). ``` attempting to do captive portal detection on interface ipsec1 attempting to do captive portal detection on interface ipsec6 ``` This PR excludes interfaces with the `ipsec` prefix from captive portal detection. Signed-off-by: Andrea Gottardo <andrea@gottardo.me>