IPV4 option (-4) should warn if both addresses are already IPV4

[jaalto]

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610979

It would be great if you could help with this as you know the code best. Please let me know if this bug can be closed based on Roland's summary in message https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610979#108

Thanks, Jari

[jaalto]

Here is Roland's patch from the above bug report. Let me know if this can be dropped in case 0.11 already has tackled the issue.

20-resolve-ipv4-address--bug601030.patch.txt

[wojtekka]

Added a warning in commit fc9e10f.