RTM_{CHANGE,LOCK} fix

[Sepherosa Ziehau]

Hi all,

Following patch is mainly used to fix RTM_{CHANGE,LOCK} support:
http://leaf.dragonflybsd.org/~sephe/rtsock.diff

gitweb:
http://gitweb.dragonflybsd.org/~sephe/dragonfly.git/shortlog/refs/heads/route

Please review it.

Best Regards,
sephe

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