loongson/pypi: links for bta

loongson/mirror bta-0.6.tar.gz
loongson/mirror bta-0.6.linux-x86_64.tar.gz
loongson/mirror bta-0.5.tar.gz
loongson/mirror bta-0.5.linux-x86_64.tar.gz
loongson/mirror bta-0.4.tar.gz