loongson/pypi: links for ffmpy3

loongson/mirror ffmpy3-0.2.4.tar.gz
loongson/mirror ffmpy3-0.2.4-py3-none-any.whl
loongson/mirror ffmpy3-0.2.3.tar.gz
loongson/mirror ffmpy3-0.2.3-py3.5.egg
loongson/mirror ffmpy3-0.2.3-py3-none-any.whl