breaks replication

NAME_CONST() didn't replicate constant character set and collation
correctly.

With this fix NAME_CONST() inherits collation from the value argument.


mysql-test/r/func_misc.result:
  A test case for BUG#34289.
mysql-test/t/func_misc.test:
  A test case for BUG#34289.
sql/item.cc:
  Inherit collation from value argument.