Winter could have been over for Nikolaj Coster-Waldau when “Game of Thrones” ended in 2019, but the Danish star put himself back in the snow for his latest adventure, “Against the Ice.”The film, which is now available on Netflix, follows the wild saga of Denmark’s Ejnar Mikkelsen, a captain, explorer and author who set out in 1909 to recover the maps and journals of a failed Artic expedition a few years prior. At stake was a dispute over Northeast Greenland, which the United States had claimed and which the Dutch were attempting to invalidate by proving that Greenland was one island. Mikkelsen had only his sled dogs and one inexperienced mate at his side for the mission, which kept getting more complicated.It’s a project that has been with Coster-Waldau for almost a decade.