Fix IPv6 ECMP handling with 4.11+ kernel

[Vincent Bernat]

 ❦ 31 août 2017 22:39 +0200, Vincent Bernat <bernat at luffy.cx> :

> Also, alien routes are correctly parsed when next-hops are correctly
> ordered (I didn't check if this restriction is also present for IPv4 or
> if Linux is always sending IPv4 multipath routes with next-hops
> correctly ordered)

It's the same for IPv4. Dunno if it should be considered as a bug?
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