What to do about warning: `extern` block uses type `u128`, which is not FFI-safe

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I used the bindgen crate to create bindings from Rust to a C library but I get a whole bunch of warnings saying:

warning: `extern` block uses type `u128`, which is not FFI-safe
= note: 128-bit integers don't currently have a known stable ABI

What can I do about this warning? I assume I need to take some action to fix this, or can I ignore it?

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