loongson/pypi: links for pbit-extract

loongson/mirror pbit_extract-0.0.7.tar.gz
loongson/mirror pbit_extract-0.0.6.tar.gz
loongson/mirror pbit_extract-0.0.5.tar.gz
loongson/mirror pbit_extract-0.0.4.tar.gz
loongson/mirror pbit_extract-0.0.3.tar.gz
loongson/mirror pbit_extract-0.0.2.tar.gz