In version 1.3.1 of `pytest-timeout` (latest) the setup.py file is not
compatible with python 2.7 and 3+ due to how `open` is called. A patch
has been added that can be removed once a fix and new relase is given.
The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.
While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.