EXCLUSIVE: In a preemptive move made as rumors of harassment allegations swirl around Andrew Duncan, June Pictures president and former ICM Partners agent Alex Saks tonight sealed plans to buy Duncan out of the company. June Pictures has fast come out of the gate as a top producer/financier of tastemaker films, including the awards season contending Sean Baker-directed The Florida Project. June Pictures is also behind Book Club, the Bill Holderman-directed ensemble that…