Message 78421 - Python tracker

In my last patch to fix the issue #4705, I replaced PyFile_FromFd() by 
custom code which set correctly the file name.

PyFile_FromFd() is also used in:
 - _Py_DisplaySourceLine(): name is not used, only 
PyFile_GetLine(file)
 - call_find_module() (imp.find_module()): return the file object with 
the wrong name

Example with imp:

>>> file, filename, extra = imp.find_module("os")
>>> file
<io.TextIOWrapper object at 0xb7b6ea6c>
>>> file.name
4
>>> filename
'/home/SHARE/SVN/py3k/Lib/os.py'