Unnesessary binary() calls have been removed


sql/field.cc:
  Unnesessary binary() calls have been removed
sql/item_strfunc.cc:
  Unnesessary binary() calls have been removed
sql/item_func.cc:
  Unnesessary binary() calls have been removed
sql/sql_analyse.cc:
  Unnesessary binary() calls have been removed
sql/filesort.cc:
  Unnesessary binary() calls have been removed