added two new test cases


BitKeeper/etc/ignore:
  Added mysql-test/r/3.23/sel000004.result.reject mysql-test/var/lib/mysql-bin.006 mysql-test/var/lib/test/elt_ck1.frm mysql-test/var/lib/test/elt_ck1.MYD mysql-test/var/lib/test/elt_ck1.MYI mysql-test/var/lib/test/elt_ck2.frm mysql-test/var/lib/test/elt_ck2.MYD mysql-test/var/lib/test/elt_ck2.MYI to the ignore list
mysql-test/r/3.23/sel000004.result:
  new result
mysql-test/r/3.23/sel000005.result:
  new result
sql/item_strfunc.cc:
  fixed bug in make_set() and elt()