bzr push into mysql-5.5 branch (mysql-re_ww:3444 to 3445)

[MySQL Release Engineering]

 3445 Karen Langford	2011-06-10 [merge]
      Merged from mysql-5.1

 3444 Mayank Prasad	2011-06-10
      Bug#12337762 : MYSQL_LIST_FIELDS() RETURNS WRONG CHARSET FOR CHAR/VARCHAR/TEXT
                     COLUMNS IN VIEWS
      
      Issue:
      charset value for a Column, returned by MYSQL_LIST_FIELDS(), was not same
      for Table and View. This was because, for view, field charset was not being
      returned.
      
      Solution:
      Added definition of function "charset_for_protocol()" in calss 
      Item_ident_for_show to return field charset value.
     @ sql/item.h
        Added definition for charset_for_protocol() function to return field charset.
     @ tests/mysql_client_test.c
        Added a test case test_bug12337762 for the changes done.

    modified:
      sql/item.h
      tests/mysql_client_test.c
No bundle (reason: useless for push emails).