[issue39593] ctypes s_set() uses strlen() and so truncates string at null character

[hai shi]

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

I am not sure it have realtion of libffi's type or not?

`s_set()` and `s_get()`'s type of ffi is `FFI_TYPE_POINTER`;

REF: https://www.manpagez.com/info/libffi/libffi-3.0.13/libffi_6.php#index-ffi_005ftype_005fpointer

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<https://bugs.python.org/issue39593>
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