Josh Brolin was convinced to join the cast of ‘Weapons’ by the “brilliant” script from Zach Cregger. The 56-year-old actor will appear in the horror thriller alongside Julia Garner and Alden Ehrenreich and explained that he was very impressed when he met the filmmaker after initially “struggling” to join the project at first. Josh told Collider: “I really liked his first movie, but it’s still new for him and all that. Then I met him a couple of times and we talked through what he was thinking. “It’s a really good script, first of all. He’s put together a really good cast, especially now – Juli…