mysql-test/r/func_set.result:
  Fix for bug #4340: find_in_set is case insensitive even on binary operators
mysql-test/t/func_set.test:
  Fix for bug #4340: find_in_set is case insensitive even on binary operators
sql/item_func.cc:
  Fix for bug #4340: find_in_set is case insensitive even on binary operators