Log Message:
Update sylpheed to 2.2.4. Changes are:
    * MIME filename encoding with RFC 2322 parameter value extension was
      supported.
    * The clear button for the quick search entry was added.
    * The bug that bold face was disabled in GtkTreeView with GLib 2.10
      and Pango 1.12 was fixed.
    * Win32: libwimp.dll was updated.
    * Win32: The bug that subfolders were duplicated when rebuilding
      folder tree while the settings were shared between Win32 and Unix
      was fixed.
    * Win32: The uninstaller was modified so that it only removes files
      and folders created by the installer.

Also remove extra blank lines at the end of options.mk to appease pkglint.