C example updated to support new package downloader API
C example updated to support new package downloader API

bgamari/librepo,cgwalters/librepo,cgwalters/librepo,rpm-software-management/librepo,cgwalters/librepo,rholy/librepo,rholy/librepo,rholy/librepo,rpm-software-management/librepo,bgamari/librepo,Tojaj/librepo,rholy/librepo,Tojaj/librepo,cgwalters/librepo,Conan-Kudo/librepo,rpm-software-management/librepo,Tojaj/librepo,Conan-Kudo/librepo,Conan-Kudo/librepo,bgamari/librepo