python.pkgs.recaptcha-client: disable broken versions

It seems that the recaptcha-client package is no longer maintained.

* The latest released version (1.0.6) is from the year 2011;
* The project page does not mention which Python versions are supported
* The project is hosted on google code, which is discontinued

I was able to succesfully build with Python versions 3.3, 3.4, but not
3.5, 3.6.