loongson/pypi: links for scons-tool-gnuplot

loongson/mirror scons-tool-gnuplot-0.7.4.tar.gz
loongson/mirror scons_tool_gnuplot-0.7.4-py3-none-any.whl
loongson/mirror scons-tool-gnuplot-0.7.3.tar.gz
loongson/mirror scons_tool_gnuplot-0.7.3-py3-none-any.whl
loongson/mirror scons-tool-gnuplot-0.7.2.tar.gz
loongson/mirror scons_tool_gnuplot-0.7.2-py3-none-any.whl
loongson/mirror scons-tool-gnuplot-0.7.0.tar.gz
loongson/mirror scons_tool_gnuplot-0.7.0-py3-none-any.whl