North Carolina indie-rock singer-songwriter MJ Lenderman hasn’t missed in recent memory, and he’s not about to start on “She’s Leaving You,” the lead single from his forthcoming Boat Songs follow-up Manning Fireworks (Sept. 6, ANTI- Records). Recorded at Asheville’s Drop of Sun Studios in between tour dates and co-produced by Lenderman with his frequent collaborator Alex Farrar, the full-length is …