loongson/pypi: links for libserial19

loongson/mirror LibSerial19-0.6.tar.gz
loongson/mirror LibSerial19-0.5.tar.gz
loongson/mirror LibSerial19-0.4.tar.gz
loongson/mirror LibSerial19-0.3.tar.gz
loongson/mirror LibSerial19-0.1.tar.gz