loongson/pypi: links for sbpipe

loongson/mirror sbpipe-4.21.0.tar.gz
loongson/mirror sbpipe-4.20.0.tar.gz
loongson/mirror sbpipe-4.19.0.tar.gz
loongson/mirror sbpipe-4.18.0.tar.gz
loongson/mirror sbpipe-4.15.0.tar.gz