link/ip6tnl: Declare rtnl_link_is_ip6_tnl()
link/ip6tnl: Declare rtnl_link_is_ip6_tnl()

Signed-off-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>
Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

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