loongson/pypi: links for xbim-flex

loongson/mirror xbim-flex-2.0.4.tar.gz
loongson/mirror xbim-flex-2.0.3.tar.gz
loongson/mirror xbim-flex-2.0.2.tar.gz
loongson/mirror xbim-flex-2.0.1.tar.gz
loongson/mirror xbim-flex-1.0.2.tar.gz
loongson/mirror xbim-flex-1.0.1.tar.gz
loongson/mirror xbim-flex-1.0.0.tar.gz