* Clinches eighth PGA Tour victory * Winds play havoc again on Monday * Choi finishes one shot behind (Adds details, quotes) LOS ANGELES, Feb 1 (Reuters) - American Brandt Snedeker won the weather-hit Farmers Insurance Open without hitting a shot on Monday as his closest pursuers succumbed to brutal conditions in southern California. Snedeker carded a brilliant three-under-par 69 on Sunday, completing his round shortly before play was halted due to unplayable conditions at Torrey Pines outside San Diego. Walker, who had eight holes left, was among those who struggled when play resumed at 11am local time. More...