loongson/mirror: links for bcp

loongson/mirror bcp-0.4.0.tar.gz
loongson/mirror bcp-0.4.0-py3-none-any.whl
loongson/mirror bcp-0.3.0-py3-none-any.whl
loongson/mirror bcp-0.2.1-py3-none-any.whl