[issue18174] Make regrtest with --huntrleaks check for fd leaks

[STINNER Victor]

STINNER Victor added the comment:

Modified patch to use os.fstat(), and try to use /proc/self/fd/ on Linux.

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Added file: http://bugs.python.org/file36147/fdleak-2.patch

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<http://bugs.python.org/issue18174>
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