loongson/pypi: links for pythonctp

loongson/mirror PythonCTP-6.3.15.3.tar.gz
loongson/mirror PythonCTP-6.3.15.3-py2.py3-none-any.whl
loongson/mirror PythonCTP-6.3.15.2.tar.gz
loongson/mirror PythonCTP-6.3.15.2-py2.py3-none-any.whl