A man has been arrested in a brutal fatal stabbing of a homeless man on a Manhattan sidewalk last month, police said Wednesday. Lin Shichun, 58, faces murder charges in the shocking Nov. 7 attack on Cheung Kan-Shing, 68, at East Broadway near Pike St. on the Lower East Side, cops said. The senior was found unresponsive with multiple stab wounds over his body, and was pronounced dead at the scene. Shichun’s arraignment was pending Wednesday night in Manhattan Criminal Court.