loongson/pypi: links for bcr-libraries

loongson/mirror bcr_libraries-0.0.4.tar.gz
loongson/mirror bcr_libraries-0.0.4-py3.7.egg
loongson/mirror bcr_libraries-0.0.3-py3.7.egg
loongson/mirror bcr_libraries-0.0.2-py3.7.egg