Update alacarte to version 3.42.0 / rev 69 via SR 945291
    
    https://build.opensuse.org/request/show/945291
    by user dimstar + dimstar_suse
    - Add python-rpm-macros BuildRequires in case some build
      environment does not pull it automatically. This is needed by
      macros like %{python3_sitelib}. (forwarded request 945215 from yfjiang)