loongson/pypi: links for chxtools

loongson/mirror chxtools-3.0.3rc3.tar.gz
loongson/mirror chxtools-3.0.3rc3-py3-none-any.whl
loongson/mirror chxtools-3.0.3rc2.tar.gz
loongson/mirror chxtools-3.0.3rc2-py3-none-any.whl
loongson/mirror chxtools-3.0.3rc1.tar.gz
loongson/mirror chxtools-3.0.3rc1-py3-none-any.whl