Update bindgen to latest version (0.65.1) to fix "not a valid Ident" error

[sburton84]

Trying to build mbedtls-sys-auto on my machine was resulting in the following error:

  thread 'main' panicked at '"x509_san_other_name_union_(unnamed_at_vendor/include/mbedtls/x509_crt_h_115_5)" is not a valid Ident', /home/sburton/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.58/src/fallback.rs:811:9

I'm not sure exactly what change on my machine causes this, it fails even when using the same rustc version as previously worked, could possibly be related to updating installed LLVM version?

Regardless, updating the bindgen version being used fixes the issue. This PR just updates bindgen (plus changes the call to rustfmt_bindings which has been deprecated).

[Taowyoo]

bors r+

[bors]

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