Update Sylpheed-devel to 2.2.0beta2.

Changes for 2.2.0beta2:
    * The forwarding of messages with attachments was modified.
    * The bug that previously selected row was removed from the view
      instead of currently selected one when deleting folders from the
      context menu was fixed.
    * Win32: The bug that messages with subject that includes
      characters that can't be used for filename couldn't be attached
      was fixed.
    * Windows-1252 was added for display encoding.
    * After incomplete POP3 session, duplicate retrieval of messages
      doesn't happen anymore.

Changes for 2.2.0beta1:
    * The major improvements of the search function were made.
          o The query search was implemented.
          o Search conditions can be specified with the same UI as the
            filter rule.
          o Subfolders can be searched.
          o The search folder (virtual folder) was implemented.
    * The maximized window state is now remembered.
    * The option "Display recipient on 'From' column if sender is
      yourself" now looks for all accounts.
    * The line-wrapping of composition now doesn't join enumerated
      lines.
    * The nonstandard Korean encoding 'ks_c_5601-1987' was supported.
    * The bug that the initial directory was not properly selected in
      the file selection dialog with GTK+ 2.8 was fixed.
    * Some other bugs were fixed.

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