[MERGE] Bugfix #125521: allow ``easy_install bzr`` runs without fatal errors

[Alexander Belchenko]

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This simple patch avoid fatal errors during easy_install of bzr.
But it also don't install bzr.1.

easy_install is really weird tool, it use some specific conventions,
and in fact require special setup.py script that use setup()
function from setuptools itself. (One weird thing about setuptools:
after it installs bzr script on my win32, this script appears
with *doubled* CRLF line-endings, despite the fact that in original
it uses LF-only.)

I don't have motivation to write special section in our setup.py
specially for setuptools, so it's very hacky solution of the
problem from https://bugs.launchpad.net/launchpad/+bug/125521

With this patch easy_install runs without fatal errors,
and installed copy of bzr is indeed working. Anyone can check
this with any bzr.dev copy, just run from bzr.dev sources root:

easy_install .

And this command will install your copy of bzr.dev as
bzr-0.19.0dev0-py2.5-win32.egg (last part of directory
name depends on your Python version and your platform).

[µ]

/me really dislike setuptools.
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