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This removes the use of suppress_ifgroup and fwmark "x/y" notation, which are, among other things, not available in busybox and centos6. We also use the return codes from the 'ip' program instead of trying to parse its output. I also had to remove the previous hack that routed all of 100.64.0.0/10 by default, because that would add the /10 route into the 'main' route table instead of the new table 88, which is no good. It was a terrible hack anyway; if we wanted to capture that route, we should have captured it explicitly as a subnet route, not as part of the addr. Note however that this change affects all platforms, so hopefully there won't be any surprises elsewhere. Fixes #405 Updates #320, #144 Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>