Test fails on a symlink on darwin

[Marc-Antoine Parent]

Good day!
Just testing the latest bzr from source on MacOSX 10.3.9.
I ran into this error:
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ERROR: runTest (bzrlib.whitebox.BranchPathTestCase)
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Traceback (most recent call last):
   File "/Volumes/Eriador/Programmation/bzr.dev/bzrlib/whitebox.py", 
line 51, in runTest
     self.assertEqual(rp('foo/bar/quux'), 'foo/bar/quux')
   File "/Volumes/Eriador/Programmation/bzr.dev/bzrlib/whitebox.py", 
line 24, in rp
     return _relpath(dtmp, p)
   File "/Volumes/Eriador/Programmation/bzr.dev/bzrlib/branch.py", line 
72, in _relpath
     raise NotBranchError("path %r is not within branch %r" % (rp, base))
NotBranchError: path '/private/tmp/tmpz0MT6N/foo/bar/quux' is not 
within branch '/tmp/tmpz0MT6N'

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This is due to the fact that /tmp is a symlink to /private/tmp on our 
platform. So the test itself probably needs fixing.
Cheers,
Marc-Antoine