examples: rtnl-route-add improvements (including IPv6 support)

Now, both IPv4 and IPv6 are supported simultaneously in one single file.

While at it:
* I moved the declarations to the beginning of the main function.
* Renamed mask by prefix, which seems more appropriate to me.
* Use RTPROTO_STATIC, as the route has been added by the administrator.
* Set NLM_F_ACK, so we get a report from the kernel about our query and
  treat reply from the kernel.
* Stricter argc checking.
* Use perror instead of printf for error reporting.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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