Merged revisions 83098 via svnmerge from

Merged revisions 83098 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/release27-maint

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  r83098 | ronald.oussoren | 2010-07-23 17:12:28 +0100 (Fri, 23 Jul 2010) | 19 lines

  Merged revisions 83096 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/branches/py3k

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    r83096 | ronald.oussoren | 2010-07-23 17:05:35 +0100 (Fri, 23 Jul 2010) | 13 lines

    Ensure that sys.prefix can reliably be found
    on OSX. This fixes a small issue that was exposed
    by running test_subprocess through regrtest (and
    hence in a subdirectory).

    Without this patch running python.exe from the
    build tree will fail when these tree conditions
    are true:
    1) the CWD is not the root of build tree
    2) python.exe is found through $PATH
    3) the framework is not yet installed
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