loongson/pypi: links for constant-time-compare

loongson/mirror constant_time_compare-1.3.tar.gz
loongson/mirror constant_time_compare-1.3.macosx-10.9-x86_64.tar.gz
loongson/mirror constant_time_compare-1.2.1.tar.gz
loongson/mirror constant_time_compare-1.2.1.macosx-10.9-x86_64.tar.gz
loongson/mirror constant_time_compare-1.2.tar.gz
loongson/mirror constant_time_compare-1.2.macosx-10.9-x86_64.tar.gz