LLVM 22 needs bindgen 0.72.1

Hey Nathan, Miguel, anyone who may run into this,

I just filed https://github.com/Rust-for-Linux/linux/issues/1247

I couldn't find this described anywhere, so posting here for wider
reach. Maybe it helps save some time.

I have run into this with the slim LLVM toolchains [1] which use LLVM
22. It could happen with any toolchain LLVM 22.

- bindgen 0.71.1 with a libclang LLVM 22 will erroneously generate
opaque types as bindings. This then leads to build errors "field does
not exist".

- Using bindgen 0.72.1 works fine.

It would be great if the slim LLVM toolchains could be updated to
bindgen 0.72.1

cheers,
Burak

[1] https://mirrors.edge.kernel.org/pub/tools/llvm/rust/