[patch] bzr on AIX

[Nathaniel McCallum]

Attached below are some small fixes to make bzr work on AIX (at least
AIX 4.3).

The main issues are that python 2.4 on AIX 4.3 doesn't have os.unsetenv
at all and that os.urandom is present, but raises NotImplimentedError
when called.  The below patch fixes these issues.

Nathaniel
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