Backport the tests only.

Merged revisions 78800 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r78800 | florent.xicluna | 2010-03-08 16:20:28 +0100 (lun, 08 mar 2010) | 2 lines

  #7624: Fix isinstance(foo(), collections.Callable) for old-style classes.
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