Update bash to rev 164 via SR 820865
    
    https://build.opensuse.org/request/show/820865
    by user WernerFink + dimstar_suse
    - Add official patch bash50-018
      * In certain cases, bash does not perform quoted null removal on patterns
        that are used as part of word expansions such as ${parameter##pattern}, so
        empty patterns are treated as non-empty.