[issue36641] make docstring in C const

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

Without any configure options:

$ size python python-const
   text    data     bss     dec     hex filename
2980860  448880  131672 3561412  3657c4 python
3185372  244464  131664 3561500  36581c python-const

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36641>
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