Update tinyxml2 to rev 5 via SR 827317
    
    https://build.opensuse.org/request/show/827317
    by user dirkmueller + dimstar_suse
    - update to 8.0.0:
      three years of changes, see https://github.com/leethomason/tinyxml2/compare/6.0.0...8.0.0
      for details