[issue39943] Meta: Clean up various issues in C internals

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Yes, it is a consequence of PR 19345. But it looks like a compiler bug. It complains about implicit conversion from `const void **` to `void *` in memcpy() and PyMem_Del().

Is it possible to add an explicit cast to make the compiler warnings quiet?

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<https://bugs.python.org/issue39943>
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