EMERGING MARKETS-Latam stocks drop on Brazil, U.S. data

* Brazil economic activity drops, suggests growth still weak * U.S. retail sales fall unexpectedly in March * Brazil Bovespa loses 0.79 pct, Mexico IPC down 0.91 pct By Asher Levine SAO PAULO, April 12 (Reuters) - Brazilian stocks fell on Friday after data showed activity in Latin America's no. 1 economy remains lackluster, while an unexpected drop in U.S. retail sales weighed on Mexico's bourse. Brazil's benchmark Bovespa stock index fell for the second straight session, l