update zbar build shell script

guowenxue

2020-08-21 1f03a4ad76f3bdc11a333045dd7f808fda913bb7

linux-bsp/tarballs/linux-3.0.tar.bz2 does not exist in tree 3e7c08d6eec0bfca4be7ad5a9bd2d79bed0304d1