Corrected the syntax for the current_user() case.
  (It's "definer = current_user[()]", not just "current_user[()]".)


mysql-test/r/view.result:
  New test case for BUG#14719
mysql-test/t/view.test:
  New test case for BUG#14719
sql/sql_yacc.yy:
  Corrected the CREATE VIEW syntax for the current_user() DEFINER case.
  (It's "definer = current_user[()]", not just "current_user[()]".)