Packaging fixes from unretirement review (#1663348)
    
    * Tue Mar 12 2019 Kevin Kofler <Kevin@tigcc.ticalc.org> - 17.08.3-11
    - Remove obsolete ldconfig scriptlets
    - Add missing Requires: hicolor-icon-theme
    - Add missing BuildRequires: gcc-c++ and (explicit) BuildRequires: cmake
    - Remove duplicate mention of the HTML documentation from the file list