0a3f558 Use both appstreamcli and appstream-util for validation of the metainfo files

Authored and Committed by mfabian a year ago
    Use both appstreamcli and appstream-util for validation of the metainfo files
    
    According to the appstream developers, appstream-util is unmaintained:
    https://github.com/ximion/appstream/issues/494#issuecomment-1521419742
    
    But I keep it in here for the time being because the Fedora packaging guidelines ask for it:
    https://docs.fedoraproject.org/en-US/packaging-guidelines/AppData/#_app_data_validate_usage
    
        
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