Add QT hello example source code and build shell script

guowenxue

2022-04-08 62e57ba339263e0737ec28418bf3fe730535f675

 3rdparty/local/build.sh

@@ -31,6 +31,8 @@
            rm -rf ${dir}/${dir}*
        fi
    done

    rm -rf install
}

if [[ $# == 1 ]] && [[ $1 == "clean" ]] ; then