macOS and Linux both return EPERM when sendto(2) is blocked by the
firewall. Sometimes these blocks and transient, in the case of a fault
between EDR software and a kernel, and at other times this may be a
persistent state.
Report a health warning for the state, and rebind only up to once every
15m in order to avoid excess workload.
Updates #11710
Updates #12891
Updates #13511
Signed-off-by: James Tucker <james@tailscale.com>
