loongson/pypi: links for pygnuplot

loongson/mirror PyGnuplot-0.12.3.tar.gz
loongson/mirror PyGnuplot-0.12.3-py3-none-any.whl
loongson/mirror PyGnuplot-0.11.16.tar.gz
loongson/mirror PyGnuplot-0.11.15.tar.gz
loongson/mirror PyGnuplot-0.10.0.tar.gz
loongson/mirror PyGnuplot-0.9.tar.gz
loongson/mirror PyGnuplot-0.8.tar.gz