python3Packages.simpleldap: remove
python3Packages.simpleldap: remove

Fairly outdated and incompatible with Python 3, see the following links
for further reference:

* https://github.com/gdub/python-simpleldap/blob/0.8/setup.py#L12-L14
* https://github.com/NixOS/nixpkgs/pull/43782#issuecomment-406186881

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