gh-90667: Cast to destructor to fix warnings

[sweeneyde]

#30872 added some compiler warnings

[sweeneyde]

Reading up on it more, this might not be 100% within the C spec.

void * and PyObject * could technically have different sizes.

[Fidget-Spinner]

Thanks.

[markshannon]

Reading up on it more, this might not be 100% within the C spec.

void * and PyObject * could technically have different sizes.

You cannot cast a function pointer to a normal pointer, or vice versa, but casting one function pointer to another is fine.
It might break strict aliasing, that is irrelevant here.