3a12f5c utils: return const char ** from dup_string_list

2 files Authored by pbrezina 5 years ago, Committed by jhrozek 5 years ago,
    utils: return const char ** from dup_string_list
    
    This function is not used anywhere and const char ** suits better
    in my use case (next patch) so I just changed the function.
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
    
        
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