loongson/pypi: links for lsystem2

loongson/mirror LSystem2-1.6.tar.gz
loongson/mirror LSystem2-1.5.tar.gz
loongson/mirror LSystem2-1.3.tar.gz
loongson/mirror LSystem2-1.3-1.src.rpm
loongson/mirror LSystem2-1.3-1.pentium3.rpm
loongson/mirror LSystem2-1.2.tar.gz
loongson/mirror LSystem2-1.1.tar.gz
loongson/mirror LSystem2-1.0.tar.gz