loongson/pypi: links for expl-perf-drop

loongson/mirror expl_perf_drop-0.5.tar.gz
loongson/mirror expl_perf_drop-0.4.tar.gz
loongson/mirror expl_perf_drop-0.3.tar.gz
loongson/mirror expl_perf_drop-0.2.tar.gz