His first feature, “El Super,” was critically acclaimed. He continued to examine culture and exile in “Crossover Dreams,” “El Cantante” and “Piñero.” An obituary by Neil Genzlinger for The New York Times. Leon Ichaso, a Cuban American filmmaker who in “El Super,” “Crossover Dreams,” “Piñero,” “El Cantante” and other movies examined themes of Latino assimilation…