loongson/pypi: links for pycopy-string

loongson/mirror pycopy-string-0.3.5.tar.gz
loongson/mirror pycopy-string-0.3.4.tar.gz
loongson/mirror pycopy-string-0.3.3.tar.gz
loongson/mirror pycopy-string-0.3.2.tar.gz
loongson/mirror pycopy-string-0.3.1.tar.gz
loongson/mirror pycopy-string-0.3.tar.gz
loongson/mirror pycopy-string-0.2.tar.gz