The workaround introduced in a23ab006
may cause a problem in certain platform (e.g., MacPorts, see GH-303)

setuptools does now allow us to install custom location without hack.
Also it does not provide uninstall feature, and `make uninstall`
leaves several files we cannot easily remove (e.g., easy-install.pth).
Therefore, it is better just exclude python bindings from `make
distcheck`.