[MERGE] Fix installation of bzrlib.benchmarks

[Aaron Bentley]

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John Arbash Meinel wrote:
>>+0 on the patch.  I like the idea, but sys.argv[0] isn't the right way
>>to get the path-- it just provides the text the user typed, without
>>following symlinks or being aware of $PATH.  Here's a tweak that uses
>>the bzrlib file path to find setup.py.

> This is already in setup.py, right?

No, this is how we find setup.py.

> I would say bzrlib.__file__ is the better way to go, but are we
> guaranteed that setup.py is next to bzrlib.

I think that's a reasonable expectation if bzr's running from a source
tree.  If it's already installed, I can't see how this test would work.

Aaron
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