ip6tnl: Use <netinet/in.h> for in6_addr and stuff
ip6tnl: Use <netinet/in.h> for in6_addr and stuff

<linux/in6.h> is not compatible with some versions of <netinet/in.h>.

Cc: Susant Sahani <7399006fbd71e08cf4dd96d77a34112e6dd38411@redhat.com>
Cc: Cong Wang <0f114804888b88d50037b04b42e57b858d851b87@gmail.com>
Signed-off-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>
Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

claudelee/libnl,tgraf/libnl,cyclops8456/libnl3,thom311/libnl,claudelee/libnl,baloo/libnl,mshirley/libnl,houstar/libnl,baloo/libnl,kolyshkin/libnl,dsahern/libnl,UnicronNL/libnl3,mshirley/libnl,kolyshkin/libnl,congwang/libnl,vyos/libnl3,tklauser/libnl,honsys/libnl,cfriedt/libnl,dsahern/libnl,cyclops8456/libnl3,honsys/libnl,cyclops8456/libnl3,greearb/libnl-ct,dsahern/libnl,mshirley/libnl,UnicronNL/libnl3,mshirley/libnl,cfriedt/libnl,vyos/libnl3,thom311/libnl,dsahern/libnl,tgraf/libnl,congwang/libnl,kolyshkin/libnl,congwang/libnl,HolyShitMan/libnl-1,cyclops8456/libnl3,greearb/libnl-ct,vyos/libnl3,claudelee/libnl,tklauser/libnl,baloo/libnl,tklauser/libnl,congwang/libnl,cfriedt/libnl,tgraf/libnl,HolyShitMan/libnl-1,UnicronNL/libnl3,cfriedt/libnl,HolyShitMan/libnl-1,houstar/libnl,kolyshkin/libnl,vyos/libnl3,UnicronNL/libnl3,houstar/libnl,claudelee/libnl,honsys/libnl,honsys/libnl,tgraf/libnl,tklauser/libnl,HolyShitMan/libnl-1,thom311/libnl,houstar/libnl,baloo/libnl,greearb/libnl-ct