python: remove inline patch and upgrade setuptools

Solves this problem:
```
~> brew upgrade
==> Upgrading 1 outdated package, with result:
python 2.7.6
==> Upgrading python
==> Downloading http://www.python.org/ftp/python/2.7.6/Python-2.7.6.tgz
Already downloaded: /Library/Caches/Homebrew/python-2.7.6.tgz
==> Patching
patching file Lib/_osx_support.py
Hunk #1 FAILED at 53.
Hunk #2 FAILED at 68.
2 out of 2 hunks FAILED -- saving rejects to file Lib/_osx_support.py.rej
patching file setup.py
Hunk #1 succeeded at 1859 (offset 49 lines).
Hunk #2 succeeded at 1904 (offset 49 lines).
Hunk #3 succeeded at 1928 (offset 49 lines).
Error: Failure while executing: /usr/bin/patch -f -p1 -i 000-homebrew.diff
```