7PM This episode's headline: High Stakes Visit; War and Famine. The guests include In Washington: CHESTER CROCKER, Former Sec. of State for African Affairs; YOICHI FUNABASHI, Journalist; In New York: AUGUST WILSON, Playwright; REPORTS FROM NEWSHOUR CORRESPONDENTS: JUDY WOODRUFF; MICHAEL BUERK; ROGER MUDD. Byline: Building Fences/Shrine to the Chief: In New York: CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JIM LEHRER, Associate Editor