update littlefs2-sys bindgen dependency to 0.60

[mykmelez]

Per rust-lang/rust-bindgen#2030, this seems to interact poorly with other bindgen dependents that also specify features = ["runtime"] (and perhaps other dependents that don't specify default-features = "false" at all).

[nathan-whittington]

This works for me.

[mykmelez]

Per the recommendation from @codysch in Slack, I've updated this crate's bindgen dependency to 0.60 instead of removing default-features = false. That's the version of bindgen we use elsewhere in JOSL, and it enables cargo xtask build -t esp32s3 -p example-hummingbird-littlefs2 to succeed for me locally.

This change is a little less upstreamable than updating the bindgen dependency to the latest available version of bindgen (0.63), which is presumably what the maintainers would do if they were doing it themselves (and perhaps what they will request if we try to upstream this change).

If we instead update this crate's bindgen dependency to 0.63, then we'd need to either update the bindgen dependencies in JOSL crates to the same version or add an unused build-dependency on bindgen 0.63 in some JOSL crate to ensure feature unification when building this crate along with JOSL crates for esp32s3. I haven't done that for now.

@codysch, are you ok with this approach?

[codysch]

I'm ok with this, though we should really update our bindgen to the latest everywhere at some point.

[mykmelez]

Agreed about updating to the latest bindgen everywhere.

Also worth noting, da42d4e suggests default features were disabled for bindgen to avoid enabling log/std, presumably for non-build dependencies, which is a problem that can now be solved by enabling the v2 Cargo resolver. So perhaps we can upstream a change that updates bindgen to 0.63, removes default-features = false, and sets resolver = "2" in the [package].