loongson/mirror: links for bib2x

loongson/mirror bib2x-0.4.2.tar.gz
loongson/mirror bib2x-0.4.2-py3-none-any.whl
loongson/mirror bib2x-0.4.0.tar.gz
loongson/mirror bib2x-0.4.0-py3-none-any.whl
loongson/mirror bib2x-0.2.0.tar.gz
loongson/mirror bib2x-0.2.0-py3-none-any.whl