loongson/pypi: links for micropython-libc

loongson/mirror micropython-libc-0.3.1.tar.gz
loongson/mirror micropython-libc-0.3.tar.gz
loongson/mirror micropython-libc-0.2.1.tar.gz
loongson/mirror micropython-libc-0.2.tar.gz
loongson/mirror micropython-libc-0.1.tar.gz