[issue1635741] Py_Finalize() doesn't clear all Python objects at exit

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

hundreds of encoding names can not be released in Py_Finalize().
for example: 
```
0x7ff482f589e0 [1] 'iso_8859_1_1987'
0x7ff482f58970 [1] 'iso_8859_1'
```
-->
```
0x7ff482f589e0 [2] 'iso_8859_1_1987'
0x7ff482f58970 [2] 'iso_8859_1'
```

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue1635741>
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