Update nudoku to version 2.0.0 / rev 6 via SR 849601
    
    https://build.opensuse.org/request/show/849601
    by user jubalh + dimstar_suse
    - Update to 2.1.0:
      * Use actual terminal background color (instead of black) as
        background color (pr #31)
      * Define minimum gettext version instead of exact one (pr #32)
      * Require gettext 0.20
      * Add Japanese translation (pr #40)
      * Minor code change
    - Drop nudoku-2.0.0-unused-var.patch: upstreamed
    - Drop nudoku-2.0.0-gettext.patch: upstreamed