loongson/pypi: links for proc-plot

loongson/mirror proc_plot-1.8.tar.gz
loongson/mirror proc_plot-1.7.tar.gz
loongson/mirror proc_plot-1.6.tar.gz
loongson/mirror proc_plot-1.5.tar.gz
loongson/mirror proc_plot-1.4.tar.gz
loongson/mirror proc_plot-1.3.tar.gz
loongson/mirror proc_plot-1.2.tar.gz
loongson/mirror proc_plot-1.1.tar.gz
loongson/mirror proc_plot-0.1.tar.gz